starparser 1.24

Manipulate and mine Relion star files.

starparser

Use this package to manipulate Relion star files, including counting, modifying, plotting, and sifting the data. At the very least, this is a useful alternative to awk commands, which can get awkward. Below is a description of the command-line options with examples for some (note: some of the options are already available in Relion with "relion_star_handler"). Alternatively, use the starparser modules in your own python scripts.

1. Installation
2. Important notes
3. Command-line options
4. Relion GUI usage
5. Scripting
6. Examples
7. License

Installation

• Set up a fresh conda environment with Python >= 3.6: conda create -n sp python=3.6 and activate it with conda activate sp.

• Install starparser: pip install starparser

Important notes

• Your input file needs to be a standard Relion .star file with an optics table, followed by another data table (e.g. particle table), followed by a list with tab-delimited columns (i.e. it does not work on *_model.star files). Typical files include run_data.star, run_itxxx_data.star, movies.star, etc.

• If the star file lacks an optics table, such as those from Relion 3.0, just add the --opticsless option to parse it (see limitations below).

• The term particles here refers to rows in a star file, which may represent objects other than particles, such as movies in a movies.star file.

Command-line options

Usage:

starparser --i input.star [options]

Input

• --i filename : Input star file.

• --f filename : The name of another file to get information from, if necessary.

Modifying

• --operate column-name[operator]value : Perform operation on all values of a column. The argument to pass is column[operator]value (without the brackets and without any spaces); operators include "*", "/", "+", and "-" (e.g. _rlnHelicalTrackLength*0.25). The result is written to a new star file (default output.star, or specified with --o). If your terminal throws an error, try surrounding the argument with quotations (e.g. "_rlnHelicalTrackLength*0.25").

• --operate_columns column1[operator]column2=newcolumn : Perform operation between two columns and output to a new column. The argument to pass is column1[operator]column2=newcolumn (without the brackets and without any spaces); operators include "*", "/", "+", and "-" (e.g. _rlnCoordinateX+_rlnOriginX=_rlnShiftedX). If your terminal throws an error, try surrounding the argument with quotations (e.g. "_rlnCoordinateX+_rlnOriginX=_rlnShiftedX").

• --delete_column column-name(s) : Delete column, renumber headers, and output to a new star file (default output.star, or specified with --o). E.g. _rlnMicrographName. To enter multiple columns, separate them with a slash: _rlnMicrographName/_rlnCoordinateX. Note that "relion_star_handler --remove_column" also does this.

• --delete_particles : Delete particles that match a query (specified with --q) within a column header (specified with --c; see the Querying options), and write to a new star file (default output.star, or specified with --o).

• --delete_duplicates column-name : Delete duplicate particles based on the column provided here (e.g. _rlnImageName).

• --delete_mics_fromlist : Delete particles that belong to micrographs that have a match in a second file provided by --f, and write to a new star file (default output.star, or specified with --o). You only need to have the micrograph names and not necessarily the full paths in the second file.

• --insert_column column-name : Insert a new column that doesn't already exist with the values found in the file provided by --f. The file should be a single column and should have an equivalent number to the star file. The result is written to a new star file (default output.star, or specified with --o).

• --replace_column column-name : Replace all entries of a column with a list of values found in the file provided by --f. The file should be a single column and should have an equivalent number to the star file. This is useful when used in conjunction with --list_column, which outputs column values for easy editing before reinsertion with --replace_column. The result is written to a new star file (default output.star, or specified with --o).

• --copy_column source-column/target-column : Replace all entries of a target column with those of a source column in the same star file. If the target column does not exist, a new column will be made. The argument to pass is source-column/target-column (e.g. _rlnAngleTiltPrior/_rlnAngleTilt). The result is written to a new star file (default output.star, or specified with --o)

• --reset_column column-name/new-value : Change all values of a column to the one provided here. The argument to pass is column-name/new-value (e.g. _rlnOriginX/0). The result is written to a new star file (default output.star, or specified with --o)

• --swap_columns column-name(s) : Swap columns from another star file (specified with --f). For example, pass _rlnMicrographName to swap that column. To enter multiple columns, separate them with a slash: _rlnMicrographName/_rlnCoordinateX. Note that the total number of particles should match. The result is written to a new star file (default output.star, or specified with --o).

• --fetch_from_nearby distance/column-name(s) : Find the nearest particle in a second star file (specified by --f) and if it is within a threshold distance, retrieve its column value to replace the original particle column value. The argument to pass is distance/column-name(s) (e.g. 300/_rlnClassNumber or 100/_rlnAnglePsi/_rlnHelicalTubeID). Outputs to output.star (or specified with --o). Particles that couldn't be matched to a neighbor will be skipped (i.e. if the second star file lacks particles in that micrograph). The micrograph paths from _rlnMicrographName do not necessarily need to match, just the filenames need to.

• --import_mic_values column-name(s) : For every particle, find the micrograph that it belongs to in a second star file (provided by --f) and replace the original column value with that of the second star file (e.g. _rlnOpticsGroup). This requires that the second star file only has one instance of each micrograph name (e.g. a micrographs_ctf.star file). To import multiple columns, separate them with a slash. The result is written to a new star file (default output.star, or specified with --o).

• import_particle_values column-name(s) : For every particle in the input star file, find the equivalent particle in a second star file (provided by --f) (i.e. those with equivalent _rlnImageName values) and replace the original column value with the one from the second star file. To import multiple columns, separate them with a slash.

• --regroup particles-per-group : Regroup particles such that those with similar defocus values are in the same group (the number of particles per group is specified here) and write to a new star file (default output.star, or specified with --o). Any value can be entered. This is useful if there aren't enough particles in each micrograph to make meaningful groups. This only works if _rlnGroupNumber is being used in the star file rater than _rlnGroupName. Note that Subset selection in Relion should be used for regrouping if possible (which groups on the *_model.star intensity scale factors).

• --new_optics optics-group-name : Provide a new optics group name. Use --c and --q to specify which particles belong to this optics group (see the Querying options). The optics values from the last entry of the optics table will be duplicated. The result is written to a new star file (default output.star, or specified with --o).

• --relegate : Remove optics table and optics column and write to a new star file (default output.star, or specified with --o) so that it is compatible with Relion 3.0. Note that in some cases this will not be sufficient to be fully compatible with Relion 3.0 and you may have to use --delete_column to remove other bad columns (e.g. helix-specific columns). Note that to use starparser on Relion 3.0 star files, you need to pass the --opticsless option.

Data mining

• --extract_particles : Find particles that match a column header (--c) and query (--q) and write them to a new star file (default output.star, or specified with --o).

• --limit_particles column/comparator/value : Extract particles that match a specific operator (lt for less than, gt for greater than). The argument to pass is "column/comparator/value" (e.g. _rlnDefocusU/lt/40000 for defocus values less than 40000). If possible, use Relion Subset Selection to do this instead.

• --count_particles : Count particles and print the result. Optionally, this can be used with --c and --q to only count a subset of particles that match the query (see the Querying options), otherwise counts all.

• --count_mics : Count the number of unique micrographs. Optionally, this can be used with --c and --q to only count a subset of particles that match the query (see the Querying options), otherwise counts all.

• --list_column column-name(s) : Write all values of a column to a file. For example, passing _rlnMicrographName will write all values to MicrographName.txt. To output multiple columns, separate the column names with a slash (for example, _rlnMicrographName/_rlnCoordinateX outputs MicrographName.txt and CoordinateX.txt). Optionally, this can be used with --c and --q to only consider values that match the query (see the Querying options), otherwise it lists all values.

• --find_shared column-name : Find particles that are shared between the input star file and the one provided by --f based on the column provided here. Two new star files will be output, one with the shared particles and one with the unique particles.

• --extract_if_nearby distance : For every particle in the input star file, check the nearest particle in a second star file provided by --f; particles that have a neighbor closer than the distance (in pixels) provided here will be output to particles_close.star, and those that don't will be output to particles_far.star. Particles that couldn't be matched to a neighbor will be skipped (i.e. if the second star file lacks particles in that micrograph). It will also output a histogram of nearest distances to Particles_distances.png (use --t to change filetype; see the Output options).

• --extract_clusters threshold-distance/minimum-number : Extract particles that have a minimum number of neighbors within a given radius. For example, passing 400/4 extracts particles with at least 4 neighbors within 400 pixels.

• --extract_indices : Extract particles with indices that match a list in a second file (specified by --f). The second file must be a single column list of numbers with values between 1 and the last particle index of the star file. The result is written to output.star (or specified with --o).

• --extract_random number-of-particles : Get a random set of particles totaling the number provided here. Optionally, use --c and --q to extract a random set of each passed query in the specified column (see the Querying options); in this case, the output star files will have the name(s) of the query(ies). Otherwise, a random set from all particles will be output to output.star (or specified with --o).

• --split number-of-files : Split the input star file into the number of star files passed here, making sure not to separate particles that belong to the same micrograph. The files will have the input file name with the suffix "_split-#". Note that they will not necessarily contain exactly the same number of particles.

• --split_classes : Split the input star file into independent star files for each class. The files will have the names "Class_#.star".

• --split_optics : Split the input star file into independent star files for each optics group. The files will have the names of the optics group.

• --sort_by column-name : Sort the columns in ascending order according to the column passed here. Outputs a new file to output.star (or specified with --o). Add a slash followed by "n" if the column contains numeric values (e.g. _rlnClassNumber/n); otherwise, it will sort the values as text.

Plotting

• --histogram column-name : Plot values of a column as a histogram. Optionally, use --c and --q to only plot a subset of particles (see the Querying options), otherwise it will plot all. The filename will be that of the column name. Use --t to change the filetype (see the Output options). The number of bins is calculated using the Freedman-Diaconis rule. Note that "relion_star_handler --hist_column" also does this.

• --plot_orientations : Plot the particle orientations based on the _rlnAngleRot and _rlnAngleTilt columns on a Mollweide projection (longitude and lattitude, respectively). Optionally, use --c and --q to only plot a subset of particles, otherwise it will plot all. The result will be saved to Particle_orientations.png. Use --t to change filetype (see the Output options).

• --plot_class_iterations classes : Plot the number of particles per class for all iterations up to the one provided in the input (skips iterations 0 and 1). Type "all" after the option to plot all classes, or separate the classes that you want with a slash (e.g. 1/2/5). It can successfully handle filenames that have "_ct" in them if you've continued from intermediate jobs (only tested on a single continue). Use --t to change filetype (see the Output options).

• --plot_class_proportions : Find the proportion of particle sets that belong to each class. At least two queries (--q, separated by slashes) must be provided along with the column to search in (--c) (See the Querying options). It will output the proportions in percentages and plot the result in Class_proportion.png. Use --t to change filetype (see the Output options).

• --plot_coordinates number-of-micrographs : Plot the particle coordinates for the input star file for each micrograph in a multi-page pdf (red circles). The argument to pass is the total number of micrographs to plot (pass "all" to plot all micrographs, but it might take a long time if there are many). Make sure you are running it in the relion directory so that the micrograph mrc files can be properly sourced (or change the _rlnMicrographName column to absolute paths). Use --f to overlay the coordinates of a second star file (blue circles); in this case, the micrograph names should match between the two star files. The plots are output to Coordinates.pdf.

Querying

• --c column-name(s) : Column query term(s). E.g. _rlnMicrographName. This is used to look for a specific query specified with --q. In cases where you can enter multiple columns, separate them with a slash: _rlnMicrographName/_rlnCoordinateX.

• --q query(ies) : Particle query term(s) to look for in the values within the specified column. To enter multiple queries, separate them with a slash: 20200101/20200203. Use --e if the query(ies) should exactly match the values in the column.

• --e : Pass this if you want an exact match of the values to the query(ies) provided by --q. For example, you must pass this if you want just to look for "1" and ignore "15" (which has a "1" in it).

Other

• --opticsless : Pass this if the input star file lacks an optics group (more specifically: the star file has exactly one table), such as with Relion 3.0 files. It will create a dummy optics table before moving on. This option does not work with --plot_class_proportions or commands that require parsing a second file.

Output

• --o filename : Output file name. Default is output.star.

• --t filetype : File type of the plot that will be written. Choose between png, jpg, svg, and pdf. The default is png.

---

Relion GUI Usage

• Use the External commands tab to run starparser within Relion. You don't need the double dash -- in this case.

---

Scripting

• To parse a star file for downstream use in a python script:

from starparser import fileparser
particles, metadata = fileparser.getparticles("file.star")

• After manipulating the particles, you can write the star file:

fileparser.writestar(newparticles, metadata, "output.star")

• A simple example showing how to iterate through micrographs and keep only one of three particles of a helix.

from starparser import fileparser

#import data to a pandas dataframe
particles, metadata = fileparser.getparticles("particles.star")

#group by micrographs
micrographs = particles.groupby(["_rlnMicrographName"])

keeplist = []

#iterate through the micrographs
for idm, micrograph in micrographs:

    #get the helices for the current micrograph
    helices = micrograph.groupby(["_rlnHelicalTubeID"])

    #iterate through the helices for this micrograph
    for idh, helix in helices:

        #get the indices for the particles
        indices = helix.index.tolist()

        #get the indices for one of every three particles in the helix
        keeplist.append(indices[::3])

#flatten the list; this is now the list of particles to keep
keeplist = [item for sublist in keeplist for item in sublist]

#write out a star file only containing those particles to keep
fileparser.writestar(particles[particles.index.isin(keeplist)], metadata, "particles_purged.star")

---

Examples

Plotting

• Plot a histogram of defocus values.

starparser --i run_data.star --histogram _rlnDefocusU

     → Output figure to DefocusU.png:

---

• Plot the particle orientation distribution.

starparser --i run_data.star --plot_orientations

     → Output figure to Particle_orientations.png:

---

• Plot the number of particles per class for the 25 iterations of a Class3D job.

starparser --i run_it025_data.star --plot_class_iterations all

     → Output figure to Class_distribution.png:

---

• Plot the number of particles per class for the 25 iterations of a Class3D job for a subset of classes.

starparser --i run_it025_data.star --plot_class_iterations 1/3/6

     → Output figure to Class_distribution.png:

---

• Plot the proportion of particles in each class that belong to particles with the term 200702 versus those with the term 200826 in the _rlnMicrographName column.

starparser --i run_it025_data.star --plot_class_proportions --c _rlnMicrographName --q 200702/200826

     → The percentage in each class will be displayed in terminal.

     → Output figure to Class_proportion.png:

---

• Overlay the coordinates of two star files.

starparser --i particles.star --f select_particles.star --plot_coordinates 1

     → Plotting coordinates from the star file (red circles) and second file (blue circles) for 1 micrograph.

     → Output figure to Coordinates.pdf:

---

Modifying

• Delete columns

starparser --i run_data.star --o run_data_del.star --delete_column _rlnCtfMaxResolution/_rlnCtfFigureOfMerit 

     → A new star file named run_data_del.star will be identical to run_data.star except will be missing those two columns. The headers in the particles table will be renumbered.

---

• Delete a subset of particles

starparser --i run_data.star --o run_data_del.star --delete_particles --c _rlnMicrographName --q 200702/200715

     → A new star file named run_data_del.star will be identical to run_data.star except will be missing any particles that have the term 200702 or 2000715 in the _rlnMicrographName column. In this case, this was useful to delete particles from specific data-collection days that had the date in the filename.

---

• Replace values in a column with those of a text file

starparser --i particles.star --replace_column _rlnOpticsGroup --f newoptics.txt --o particles_newoptics.star

     → A new star file named particles_newoptics.star will be output that will be identical to particles.star except for the _rlnOpticsGroup column, which will have the values found in newoptics.txt.

---

• Swap columns

starparser --i run_data.star --f run_data_2.star --o run_data_swapped.star --swap_columns _rlnAnglePsi/_rlnAngleRot/_rlnAngleTilt/_rlnNormCorrection/_rlnLogLikeliContribution/_rlnMaxValueProbDistribution/_rlnNrOfSignificantSamples/_rlnOriginXAngst/_rlnOriginYAngst

     → A new star file named run_data_swapped.star will be output that will be identical to run_data.star except for the columns in the input, which will instead be swapped in from run_data_2.star. This is useful for sourcing alignments from early global refinements.

---

• Regroup a star file

starparser --i run_data.star --o run_data_regroup200.star --regroup 200

     → A new star file named run_data_regroup200.star will be output that will be identical to run_data.star except for the _rlnGroupNumber or _rlnGroupName columns, which will be renumbered to have 200 particles per group.

---

• Create a new optics group for a subset of particles

starparser --i run_data.star --o run_data_newoptics.star --new_optics myopticsname --c _rlnMicrographName --q 10090

     → A new star file named run_data_newoptics.star will be output that will be identical to run_data.star except that a new optics group called myopticsname will be created in the optics table and particles with the term 10090 in the _rlnMicrographName column will have modified _rlnOpticsGroup and/or _rlnOpticsName columns to match the new optics group.

---

• Relegate a star file to be compatible with Relion 3.0

starparser --i run_data.star --o run_data_3p0.star --relegate

     → A new star file named run_data_3p0.star will be output that will be identical to run_data.star except will be missing the optics table and _rlnOpticsGroup column. The headers in the particles table will be renumbered accordingly.

---

Data mining

• Extract a subset of particles

starparser --i run_data.star --o run_data_c1.star --extract_particles --c _rlnClassNumber --q 1 --e

     → A new star file named run_data_c1.star will be output with only particles that belong to class 1. The --e option was passed to avoid extracting any class with the number 1 in it, such as "10", "11", etc.

---

• Extract particles with limited defoci

starparser --i run_data.star --o run_data_under4um.star --limit_particles _rlnDefocusU/lt/40000

     → A new star file named run_data_under4um.star will be output with only particles that have defocus estimations below 4 microns.

---

• Count specific particles

starparser --i particles.star --o output.star --count_particles --c _rlnMicrographName --q 200702/200715

     → There are 7726 particles that match ['200702', '200715'] in the specified columns (out of 69120, or 11.2%).

---

• Count the number of micrographs

starparser --i run_data.star --count_mics

     → There are 7994 unique micrographs in this dataset.

---

• Count the number of micrographs for specific particles

starparser --i run_data.star --count_mics --c _rlnMicrographName --q 200826

     → Creating a subset of 2358 particles that match ['200826'] in the columns ['_rlnMicrographName'] (or 3.4%)

     → There are 288 unique micrographs in this dataset.

---

• List all items from a column in a text file

starparser --i run_data.star --list_column _rlnMicrographName

     → All entries of _rlnMicrographName will be written to MicrographName.txt in a single column.

---

• List all items from multiple columns in independent text files

starparser --i run_data.star --list_column _rlnDefocusU/_rlnCoordinateX

     → All entries of _rlnDefocusU will be written to DefocusU.txt and all entries of _rlnCoordinateX will be written to CoordinateX.txt.

---

• List all items from a column that match specific particles

starparser --i run_data.star --list_column _rlnDefocusU --c _rlnMicrographName --q 200826

     → Only _rlnDefocusU entries that have 200826 in _rlnMicrographName will be written to DefocusU.txt.

---

• Compare particles between star files and extract those that are shared and unique

starparser --i run_data1.star --find_shared _rlnMicrographName --f run_data2.star

     → Two new star files will be created named shared.star and unique.star that will have only the particles that are unique to run_data1.star relative to run_data2.star (unique.star) and only the particles that are shared between them (shared.star) based on the _rlnMicrographName column.

---

• Extract a random set of specific particles

starparser --i run_it025_data.star --random 10000 --c _rlnMicrographName --q DOA3/OAA2

     → Two new star files will be created named DOA3_10000.star and OAA2_10000.star that will have a random set of 10000 particles that match DOA3 and OAA2 in the _rlnMicrographName column, respectively.

---

• Split a star file

starparser --i particles.star --split 3

     → Three new star files called split_1.star, split_2.star, and split_3.star will be created with roughly equal numbers of particles. In this example, particles.star has 69120 particles and the split star files have 23053, 23042, and 23025 particles, respectively.

---

License

This project is licensed under the MIT License - see the LICENSE.txt file for details.