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Effect of RA‐VII on tumor angiogenesis. Tumor sections obtained on day 15 were stained for CD31 as described in Materials and Methods. (a) Fluorescent images of CD31‐positive cells. Scale bars = 200 µm. (b) Quantification of vascular luminal area of the tumor. Vessel areas were calculated as the mean of five fields per section and the values are expressed as the mean ± SD of four sections. **P < 0.01 versus vehicle.
