<https://www.coursehero.com/file/p4r6t869/are-also-composed-of-dead-epidermal-cells-that-are-converted-to-keratin-New/#webpage>
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"are also composed of dead epidermal cells that are converted to keratin New from BIO 258 at University of Rochester"
<https://www.coursehero.com/file/p4r6t869/are-also-composed-of-dead-epidermal-cells-that-are-converted-to-keratin-New/>