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    GlossaryInner Root Sheath

    layer of cells supporting and shaping the growing hair shaft

    The Inner Root Sheath (IRS) is a layer of cells that surrounds and supports the growing hair shaft within the hair follicle. It plays a crucial role in shaping the hair and guiding it as it emerges from the scalp. The IRS is composed of three distinct layers: Henle's layer, Huxley's layer, and the cuticle of the inner root sheath, each contributing to the structural integrity and function of the hair follicle.

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