- Osteonectin cDNA sequence reveals potential binding regions for calcium and hydroxyapatite and shows homologies with both a basement membrane protein (SPARC) and a serine proteinase inhibitor (ovomucoid). Bolander, M.E., Young, M.F., Fisher, L.W., Yamada, Y., Termine, J.D. Proc. Natl. Acad. Sci. U.S.A. (1988)