<protein> The protein substance of the white fibers (collagenous fibers) of skin, tendon, bone, cartilage and all other connective tissue, composed of molecules of tropocollagen.It is converted into gelatin by boiling. 

Collagenous: pertaining to collagen, forming or producing collagen. 

Origin: Gr. Kolla = glue, gennan = to produce

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Source: OMD