For UniProtKB chain IDs of SARS-CoV-2 proteins, where we've chosen one arbitrarily, add the other as a xref in our curated GPI file

[justaddcoffee]

Example:
For nsp5, our canonical ID is PRO_0000449623 (this is their ID when protein is cleaved from replicase polyprotein 1ab)

Need to add PRO_0000338259 (ID if cleaved from replicase polyprotein 1a) to the xref column in the GPI