They lack of a protective keratin layer and therefore burn easily.
它缺乏一种保护的角朊层，因此容易晒裂。
Structure characterization and spectrum investigation suggest that the iridescent color of the green and purple barbules should originate from the interference from the top keratin cortex layer.
结构和光谱都说明这两种羽毛的虹彩色都是来由角蛋白表皮的干涉效应造成的。
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