check_ID is used to check candidate IDs supplied in a character or list object.
Multiple IDs can be separated by a semicolon.
“Known” IDs are those that are present in the human_aa dataset of amino acid compositions.
If aa_file is specified, additional amino acid compositions to be considered are read from this file, which should be in the same format as e.g. human_extra.csv (see also thermo$protein).
If updates_file is specified, these ID mappings are included alongside the packaged uniprot_updates.