text: Epidermic layers named for Huxley and Henle surround the cells that produce this substance.
full_question: Epidermic layers named for Huxley and Henle surround the cells that produce this substance. The Ferriman-Gallwey index is used to measure abnormalities in the production of this substance in women, particularly in hirsutism. Glands near the production site of this substance coat it in oily sebum. Melanocytes produce the pigments that color this substance, which is also keratinized to give it structure. For 10 points, name this substance that covers the body of most mammals.
first_sentence: Epidermic layers named for Huxley and Henle surround the cells that produce this substance.