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Comparison of MVD between the MSC injection and no MSC injection groups. (A) MVD of tumor tissues in the MSC injection group was visualized by immunohistochemical staining, using cluster of differentiation 31 antibody. The sample was observed under a light microscope (magnification, ×20). Brown coloring indicated microvessel positivity. (B) MVD in the group without MSC injection. MVD, microvessel density; MSC, mesenchymal stem cells.
