Figure 3. Calvarial defects at 12 wks. (a,c) Photomicrographs (H & E-stained) and (b,d) µCT images of cross-sections of the calvarial defect sites implanted with (a,b) bone marrow stromal cells alone and (c,d) co-transplantated with endothelial cells. Arrows demarcate defect margins (8.5-mm defect). Size bars are shown in (a) and (c).