the rate of crystal proliferation is promoted by the availability of ca2+ , po4 ( 3- ) , and the presence of collagen , and retarded by naturally occurring inhibitors of mineralization such as proteoglycans and several noncollagenous calcium-binding proteins of bone including bone-gla protein ( osteocalcin ) , phosphoproteins , osteonectin , and alpha-2hs-glycoproteins .
C0006732
calcium-binding proteins
C0029419
osteocalcin