#scleroprotein__albuminoid  a simple protein found in horny and cartilaginous tissues and in the lens of the eye
  supertype:  simple_protein  a protein that yields only amino acids when hydrolyzed
  subtype:  collagen  a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling
  subtype:  elastin  a fibrous scleroprotein found in elastic tissues such as the walls of arteries
  subtype:  gelatine__gelatin  a colorless water-soluble glutinous protein obtained from animal tissues such as bone and skin
  subtype:  keratin__ceratin  a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves

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