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CD31 expression of human umbilical vein endothelial cells detected by flow cytometry and representative images of co‐cultures networks. A, The expression level of CD31 antigen was 0.8% in the control group, while it was 99.5% in the experimental group. B, The representative images showed that HTR8/SVneo cells integrated into endothelial cellular networks. Original magnification ×200. The scale bars indicate 200 μm
