also: こうたんぱくしつ
noun
scleroprotein
Technical term in biology for structural proteins such as collagen and keratin.
コラーゲンは硬タンパク質の一種です。
Collagen is a type of scleroprotein.
Variant with hiragana たんぱく; less common but still seen in some contexts.
Full kanji spelling using 蛋白; now rare and mostly replaced by katakana タンパク.
General term for protein; 硬タンパク質 is a specific subclass.
Compound of 硬 (hard) and タンパク質 (protein), a calque of English 'scleroprotein'.