obsolete peptide cross-linking via S-[5'-(L-tryptoph-6'-yl)-L-tyrosin-3'-yl]-L-methionin-S-ium (obsolete GO:0050739)
OBSOLETE. The cross-linking of a tyrosine residue to a tryptophan residue and a methionine residue to form S-[5'-(L-tryptoph-6'-yl)-L-tyrosin-3'-yl]-L-methionin-S-ium.