scleroprotein

(sklir′ə prōtēn′, skler′-; -prōtē in)

noun

any of a class of fibrous animal proteins insoluble in water, including the keratins and collagens

See scleroprotein in American Heritage Dictionary 4

noun
  1. Any of a class of generally insoluble proteins, such as collagen, found in skeletal and connective tissue. Also called albuminoid.
  2. The protein that permeates the chitin of arthropods.

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