Figure 6. Microvessel formation in G4 and E9 tumors grown beneath the renal capsule of male severe combined immunodeficient mice. (A) Immunohistochemical staining for mouse-specific CD31 in tumors; 200x original magnification. (B) Comparison of microvessel numbers between G4 and E9 tumors. Mouse-specific CD31⁺ vessels with a lumen were counted in 10 different areas at 200x magnification. Values represent the means ± SD.