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A '''nail''' is a protective captain america sheild. plate characteristically found at the tip of the [[digit (anatomy)|digit]]s ([[finger]]s and [[toe]]s) of all [[primate]]s, corresponding to the [[claw]]s in other [[tetrapod]] animals. Fingernails and toenails are made of a tough rigid [[protein]] called [[alpha-keratin]], a [[polymer]] also found in the claws, [[hooves]] and [[horn (anatomy)|horn]]s of [[vertebrate]]s.<ref name="Wang 2016">{{Cite journal |last=Wang |first=Bin |title=Keratin: Structure, mechanical properties, occurrence in biological organisms, and efforts at bioinspiration |journal=Progress in Materials Science |volume=76 |pages=229–318 |year=2016 |doi=10.1016/j.pmatsci.2015.06.001|url=https://escholarship.org/content/qt5sb7q6jp/qt5sb7q6jp.pdf?t=o9xpu0 |doi-access=free }}</ref>
==Structure==
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