Fig. 4From: Combining mesenchymal stem cell sheets with platelet-rich plasma gel/calcium phosphate particles: a novel strategy to promote bone regenerationScanning electron microscopy of CaP particles (a), PRP gel (b), PRP gel/CaP particles (c), BMSC sheet-wrapped CaP particles (d) and BMSC sheet-wrapped PRP gel/CaP particles composite (e)Back to article page