上皮细胞层主要由3种细胞组成：基底细胞（basal cells)、翼状细胞（wing cells）和表层细胞（superficial cells）。上皮层细胞再生能力很强，临床上所见的角膜上皮损伤24小时内即可再生。
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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.
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。
Small drones are being developed with highly efficient wing-bottom infra-red cells that scavenge radiation energy reflected up from the ground.
有人正在研制一种小型无人机，机翼底部设有高效红外电池，能够捕捉地面反射的辐射能。
The west wing of the canopy is covered in transparent solar cells, which are oriented to optimize energy production.
顶棚西翼覆盖着透明的太阳能电池，可以转动方向以达到最大的发电效果。
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