Dopa and the red, brown and black pigments of hair and feathers.
D000818:Animals; D002417:Cattle; D002645:Chickens; D002845:Chromatography; D002850:Chromatography, Gel; D002855:Chromatography, Thin Layer; D003545:Cysteine; D004295:Dihydroxyphenylalanine; D004285:Dogs; D005241:Feathers / Q000032:analysis*; D006197:Hair / Q000032:analysis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007501:Iron; D010860:Pigments, Biological / Q000032:analysis / Q000138:chemical synthesis*; D013053:Spectrophotometry
D010860:Pigments, Biological; D004295:Dihydroxyphenylalanine; D007501:Iron; D003545:Cysteine