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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ConclusionThe superficial cells of limbus and cornea are of mature status, while limbal basal cells show some undifferentiated feature, which indicates the location of stem cells.
结论角膜及角膜缘表层上皮较为成熟分化，而角膜缘基底细胞具有未分化细胞的特征，很可能是干细胞的部位。
The superficial epithelia cells do not bind the active ingredient and thus only serve as a transit area.
浅表的上皮细胞并不与活性药物成分结合，因而只是运输区。
When the HPV protein was positive, the weak positive reaction was found in the superficial epithelial cells of the condyloma condyloma.
HPV蛋白阳性时，尖锐湿疣的浅表上皮细胞内可出现淡红色的弱阳性反应。
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