COLLAGEN : an insoluble fibrous protein of vertebrates that is the chief constituent of the fibrils of connective tissue (as in skin and tendons) and of the organic substance of bones and yields gelatin and glue on prolonged heating with water
CONNECTIVE TISSUE DISEASE: any of various diseases or abnormal states (as rheumatoid arthritis, systemic lupus erythematosus, polyarteritis nodosa, rheumatic fever, and dermatomyositis) characterized by inflammatory or degenerative changes in connective tissue called also collagen disease, collagenolysis, collagen vascular disease.
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