Histology study. Immunofluorescence staining of various tissue slices of (A) U87MG tumor (targeted group), (B) U87MG tumor (non-targeted group), (C) Liver, (D) Spleen and (E) Muscle. Red staining represents CD31 (using anti-mouse CD31 primary antibody), while green staining represents GO-VEGF121 (using Avastin as the primary antibody). Scale bar: 100 μm. Note, Slices of liver, spleen and muscle were all from targeted group.