Assertion: periosteum's progenitor cell | /r/HasProperty | seeded on collagen
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Source sentences:
text: Inclusion of periosteal strips in the modular implant resulted in significantly better outcomes than did inclusion of collagen membranes seeded with progenitor cells; factors intrinsic to the periosteum may account for the significantly improved regenerative capacity of periosteal transplants over progenitor cells seeded on collagen.