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    GlossaryEpithelial Sac

    small, enclosed structure of epithelial cells around hair follicle

    An epithelial sac is a small, enclosed structure composed of epithelial cells, which are cells that line the surfaces and cavities of the body. In the context of hair biology, an epithelial sac can refer to the structure that surrounds the developing hair follicle, playing a crucial role in the formation and growth of hair. This sac provides a protective environment and supplies necessary nutrients to the growing hair shaft.

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