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Osteoid matrix proteins.
| (1) Collagen type I (90%) |
| (2) Noncollagenous proteins (10%) |
| (i) Glycoproteins: |
| (a) Alkaline phosphatase |
| (b) RGD sequence-glycoproteins (osteopontin, osteonectin, fibronectin, thrombospondin, and bony sialoprotein) |
| (ii) Proteoglycans |
| (iii) Proteins with γ-carboxyglutamic acid (osteocalcin, osteoid protein γ-carboxyglutamic acid) |
| (iv) Serum proteins retained in the bone |
