Assertion: periosteum's progenitor cell | /r/CapableOf | differentiate into osteoblast
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text: As the bone develops, osteoblast progenitor cells differentiate into osteoblasts in the deep layers of the periosteum, contributing to mineralization of an osseous ring around the anlage, and eventually to the enlargement of the bone diaphysis and apposition of new bone by intramembranous ossification.