In order to update the featureDatabase object, all *.txt files in the folder /path/to/meta.dir/FeatureLists are read, processed and the feature "Cells.Infection_IsInfected" is added. The filenames determine the list slot names, so they should be formatted as PATHOGEN-*.txt.
NULL (invisibly). The updated featureDatabase object saved to the /data folder. For the new file to be available, the package has to be reloaded.
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