. "\"The formation of a protein active site cross-link from the alpha-carboxyl carbon of residue N, a cysteine, to the alpha-amino nitrogen of residue N+2, a glycine, coupled with the formation of a double bond to the alpha-amino nitrogen of residue N+1 which loses one hydrogen, and the loss of a molecule of water.\" [RESID:AA0188]" . . "peptide cross-linking via L-cysteinyl-5-imidazolinone glycine" . "RESID:AA0188" . . .