RETRACTED: Activation and silencing of matrix metalloproteinases

This article has been retracted at the request of the author. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: This article contained substantial duplications of another article published earlier by the corresponding author (W.C. Parks): Ra, H.J. and Parks, W.C. Control of matrix metalloproteinase catalytic activity. Matrix Biol., 26 (2007) 587–596. As this article has been retracted, it should not be cited.