UniProtKB canonical isoform ID numbers (e.g., P11413‐X, “X” representing the isoform name) were identified for multi‐isoform associated UniProtKB entries by comparing the 2018 UniProtKB FASTA file (used to count total isoforms per UniProtKB entry) and the UniProtKB ID mapping (idmapping.dat) file from August 01, 2018, release downloaded August 06, 2018. The FASTA file displays the canonical protein isoform ID with no isoform name details, but the idmapping.dat file displays the canonical isoform protein ID with these details.
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