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Representative tumor slices from ovarian cancer xenograft confirm endoglin expression on tumor vascular endothelial cells (arrows) by immunofluorescence (scale bar = 100 μm). Tumor slices stained for (a) endothelial cell–specific marker CD31 (green) and (b) endoglin (red). (c) Merged image demonstrates coexpression of endoglin and CD31 (yellow) on tumor endothelial cells.
