Gene mapping files (*.gene2acc)
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Column 1 is a unique gene symbol that is chosen with the following order of
preference from the annotation found in:
1) Model Organism Database (MOD)
2) Ensembl or Ensembl Genomes database
3) UniProt Ordered Locus Name (OLN)
4) UniProt Open Reading Frame (ORF)
5) UniProt Gene Name
A dash symbol ('-') is used when the gene encoding a protein is unknown.

Column 2 is the UniProtKB accession or isoform identifier for the given gene
symbol. This column may have redundancy when two or more genes have identical
translations.

Column 3 is the gene symbol of the canonical accession used to represent the
respective gene group and the first row of the sequence is the canonical one.