Tags: Protein.

Not to be confused with Osteocalcin or Osteopontin.Osteonectin (ON) also known as secreted protein acidic and rich in cysteine (SPARC) or basement-membrane protein 40 (BM-40) is a protein that in humans is encoded by the SPARC gene.Osteonectin is a glycoprotein in the bone that binds calcium. It is secreted by osteoblasts during bone formation initiating mineralization and promoting mineral crystal formation. Osteonectin also shows affinity for collagen in addition to bone mineral calcium.

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