obsolete peptide cross-linking via 4'-(S-L-cysteinyl)-L-tryptophyl quinone (obsolete GO:0019927)
OBSOLETE. The cross-linking of a cysteine residue to tryptophyl quinone to form 4'-(S-L-cysteinyl)-L-tryptophyl quinone, a cofactor found at the active site of amine dehydrogenase.