?:definition
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The formation of a protein active site cross-link from the alpha-carboxyl carbon of residue n, an alanine, serine or cysteine, to the alpha-amino nitrogen of residue n+2, a glycine, and a dehydration to form a double bond to the alpha-amino nitrogen of residue n+1. This cross-linking is coupled with an oxidation of residue n+1 to form an active aldehyde. [RESID:AA0184, RESID:AA0187, RESID:AA0188]
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