带有铜类色素的翅羽，飞行和展示用，彼得·穆伦博士惠赠
Wing feather with copper-containing pigment, flight and display, Courtesy Peter Mullen, Ph.D.
后来的翼的发育过程中，产生了无翅基因这种形成机制，并且通过促进特定区域的细胞生成色素的方法来在翼上扩散花纹。
Late in wing development, the Wingless morphogen is produced and diffuses through tissue where it prompts cells in certain areas of the wing to make pigment.
带有铜类色素的翅羽，飞行和展示用，彼得·穆伦博士惠赠。
Wing feather with copper-containing pigment, flight and display, Courtesy Peter Mullen, Ph. D.
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