Figure 6. RG1-MSC-CM improves the angiogenesis of intestine in irradiated rats. (A) Immunofluorescence staining with CD31. Intestinal samples were collected and stained on day 3 after radiation. Arrowheads indicate a CD31-positive area. Scale bars 100 μm. (B) Quantification of CD31+ area fraction. Data represent mean ± SD for “hot spot” area. Each group contains at least 3 rats (3-4 section/rat). ##, P < 0.05 versus IR + DMEM-F12. **, P < 0.05 versus Control. All data were analyzed by t-test or one-way ANOVA except as otherwise indicated.