Fig. 3From: Systemic administration of mesenchymal stem cells combined with parathyroid hormone therapy synergistically regenerates multiple rib fracturesPTH induces hMSC differentiation into osteoprogenitor cells. Immunohistochemistry was performed on tissue samples harvested 8Â weeks after surgery. The sections were stained with antibodies against the well-established osteogenic markers osteocalcin (Oc) and bone sialoprotein (BSP), in addition to DAPI staining. Yellow arrows indicate bone defect margins; orange arrows indicate co-staining of DiI and bone markers. MSCs mesenchymal stem cells, PTH parathyroid hormoneBack to article page