n. 角蛋白

[化] 角蛋白

[医] 角蛋白

[ noun ]
a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves
<noun.substance>

keratin \ker"a*tin\, n. [Gr. ke`ras, -atos, horn.] (Physiol.
Chem.)
A sulfur-containing fibrous protein constituting the main
structural protein of hard epidermal tissues, such as horn,
hair, feathers, nails, claws, hoofs, and the like. It is an
insoluble substance, and, unlike elastin, is not dissolved
even by gastric or pancreatic juice. By decomposition with
sulphuric acid it yields leucine and tyrosine plus various
other acid-stable amino acids. The amino acid composition
varies, but it usually has a high percentage of cystine,
which stabilizes and insolubilizes the protein by forming
intrachain linkages. A softer form of keratin is present in
the epidermis and whalebone. Called also {epidermose}.
[1913 Webster +PJC]