Evidence that human rheumatoid synovial matrix metalloproteinase 3 is an endogenous activator of procollagenase Ito, A.; Nagase, H. Archives of Biochemistry and Biophysics 267(1): 211-216 1988 0003-9861 10.1016/0003-9861(88)90025-2 https://eurekamag.com/research/007/326/007326511.php