It is an extension of data.frame and has these columns:
patient_id
hla_genotype
The value of the patient_id column gets treated as a regular expression when it is matched to the FASTA headers in the query_alignment. If the value is set to .* then the hla_genotype corresponding to this entry will be matched to all the sequences in the query alignment.
The hla_genotype column should be a name from the LANL table.
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