The Monarch Butterfly breathes through its wings and female Monarchs have thicker wing veins.
帝王蝶通过翅膀呼吸，雌性帝王蝶有更加厚实的翅膀脉络。
In Drosophila guttifera, the morphogen ACTS in proximity to existing physical landmarks such as the intersections of veins and cross veins on the wing.
对Drosophila guttifera来说，形态生成是在已有的物理路标附近作用的，如在翅膀的静脉血管与横向静脉的交点处。
“You hold the wing up against the light, so you can see the veins,” said study co-author Daniel Janzen, an evolutionary ecologist at the University of Pennsylvania.
“如果你把昆虫的翅膀举起来对着光线，那么你就能很清晰地看到里面的脉络，”学术合著人，宾夕法尼亚大学的生物进化学家Daniel Janzen如是说。
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