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Photomicrographs demonstrating FLT-1 immunostaining of an excised fibrovascular membrane (A). Immunoreactivity for FLT-1 was abolished in a control specimen of excised membrane processed with omission of the primary antibody (B) and GFAP staining of the same excised membrane (C). Intense staining was observed around the vessels in excised membranes. Magnification A, B, C ×60.
