bone gamma-carboxyglutamic acid ( gla ) -containing protein ( bgp or osteocalcin ) and 44 kda bone phosphoprotein ( 44k bpp , also called sialoprotein i or osteopontin ) have been localized at the ultrastructural level in osteoblasts from woven bones of newborn rats .
C0033684
protein
C0031689
phosphoprotein