. "The modification of protein tyrosine to peptidyl-L-3',4'-dihydroxyphenylalanine (DOPA)." . . . "peptidyl-L-3',4'-dihydroxyphenylalanine biosynthetic process from peptidyl-tyrosine" . "peptidyl-L-3',4'-dihydroxyphenylalanine anabolism from peptidyl-tyrosine" . "peptidyl-L-3',4'-dihydroxyphenylalanine formation from peptidyl-tyrosine" . "peptidyl-L-3',4'-dihydroxyphenylalanine synthesis from peptidyl-tyrosine" . . . .