Assertion: endosteum's osteoblast | /r/HasProperty | collagen
Facets:
Source sentences:
text: osteoblasts -bone forming cells that secrete the bone matrix -actively mitotic -the unmineralized bone matrix they secrete includes collagen (90% of bone protein) and calcium-binding proteins that make up osteoids -play an important role in matrix calcification -cube shaped when actively depositing matrix -when inactive they resemble the flattened osteogenic cells or may differentiate into bone lining cells -when completely surrounding by the matrix being secreted, they become osteocytes