“…MMPs 1 and 13 were selected as they are known to be active against fibrillar collagens, including the predominant collagen type I 1, 28, 29, 30. MMP‐3 was selected as it degrades other minor proteins in tendon matrix, including collagens III, IV, IX, and X, and also proteoglycans and elastin 28, 29, 30, 31, 32, 33. The C1,2C (or COL 2 3/4C short) antibody detects the carboxy terminus of fragmented type I and II collagen, cleaved by collagenases MMP‐1, MMP‐8 or MMP‐13 21, 34, 35, 36, 37…”