insoluble pigments that account for the color of e.g. skin and scales and feathers
melanin详细解释
mel.a.nin n.（名词）Any of a group of naturally occurring dark pigments, especially the pigment found in skin, hair, fur, and feathers.黑色素：天然黑色素，尤指皮肤、头发、毛皮及羽毛中的色素
