A substitute for embryonic epithelium has yet to be identified, although purported adult stem cells have been discovered in other tissues with epithelial origins, such as skin and hair.

• 可以取代胚胎上皮的替代品还没有找到，但其他由上皮形成的组织（是皮肤与毛发）则有可能已经找到了成年干细胞。