> as lemmas

1907 Halliburton & Hopkins in Jrnl. Physiol. 35 Suppl. p. xix Sclero-proteins. This new word takes the place of the word albuminoid... It includes such substances as gelatin and keratin; the prefix indicates the skeletal origin and often insoluble nature of its members.

1958 Immunology 1 49 Some of the scleroproteins comprising the scale plate are antigenic, but are only slowly digested by homologous recipients.

1970 R. M. Black Elements Palaeontol. ii. 8 The matrix of bone consists mainly of collagen (a fibrous scleroprotein) hardened by mineral salts.

1977 A. Hallam Planet Earth 241 More usually, however, only the most resistant and stable organic materials can survive long after death, as with the lignified tissues of fossil land plants and the scleroprotein skeleton of the extinct fossil graptolites.