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Noun collagen has 1 sense
  1. collagen - a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling
    --1 is a kind of     scleroprotein, albuminoid
    --1 is a substance of
     bone, os; cartilage, gristle; connective tissue; tendon, sinew
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