The outer layer of the barbules consists of a two-dimensional crystal framework made of melanin rods connected by keratin — a fibrous protein — in a lattice pattern.
The outer layer of the barbules consists of a two-dimensional crystal framework made of melanin rods connected by keratin — a fibrous protein — in a lattice pattern.
外层的小羽枝由一个二维的结晶状结构组成，由黑色素杆状细胞构成，与角蛋白相连——一种纤维状蛋白质——在一种格子式样图案里面。