Assertion: periosteum's cell | /r/CapableOf | mark with smooth muscle actin
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Source sentences:
text: Endothelial cells do not appear to transdifferentiate into skeletal progenitors involved in fracture healing as cartilage and bone within the callus are not derived from Tie2‐expressing cells.48 Pericytes marked with smooth muscle actin, however, coincide with a population of endogenous mesenchymal progenitors and can largely contribute to fracture healing.49