Before revision: Matrix metalloproteinase-20 (MMP20) proteolytically cleaves the secreted enamelin protein into several smaller polypeptides , each having their own functions.
After revision: At the secretory stage, the enzyme matrix metalloproteinase-20 (MMP20) proteolytically cleaves the secreted enamelin protein into several smaller polypeptides ;immediately upon release, each having their own functions.