Fig. 4From: Exosomal miRNA-128-3p from mesenchymal stem cells of aged rats regulates osteogenesis and bone fracture healing by targeting Smad5a, b Micro-CT images and Callus volumes (scale: 1 mm). c BV/TV on day 28. d The mRNA levels of Runx2, ALP and Collagen I in calluses (n = 4, PBS vs Age-Exos, P < 0.05, Age-Exos vs Young-Exos, P < 0.05)Back to article page