what does 'pca' in a protein sequence mean?

Benny benny at holmes.nott.ac.uk
Tue Feb 13 07:24:25 EST 2001

I was looking at some sequences in the Kabat database of immunoglobulin
sequences and I see the abbreviation "pca" at the first N-terminal residue.
Can anyone please tell me what this stands for? Is it an actual amino acid?

Many thanks.


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