Western blot staining results of placenta (P), vascular malformation (VM) without vascular proliferation (V), and VM with immature capillary proliferation (A) in nine VEGF antibodies. Arrowheads indicate that RB-9031 demonstrated a distinct band at 45 kDa in Lane A, whereas only a weak band is found in Lane V. Nearly the same observation is seen in RB-222, but more nonspecific background staining is included here. After stripping, the membranes were restained with β-actin antibody.