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Endothelial cells were identified by immunofluorescence using anti-CD31 (PE-CAM) in tumor cryosections from mice inoculated with BM-VPC-WT or BM-VPC-Dll4. Scale Bar indicates 250 µm. Graphs show the number of microvessels per section (values show the mean plus s.e.m. *: P<0.05).
