The Usefulness of 4‐Amino‐3‐hydroxyphenylalanine as a Specific Marker of Pheomelanin

Abstract
Reductive hydrolysis of pheomelanin with hydriodic acid (HI) gives two aminohydroxyphenylalanine isomers, 4‐amino‐3‐hydroxyphenylalanine (`specific AHP') and 3‐amino‐4‐hydroxyphenylalanine (3‐aminoty...