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Flk1 is expressed in vascular structures within retrolental tissue in Arf−/− eye. Sections of P1 Arf−/− eye stained with α-Flk1 antibody (A, C) or unrelated primary antibody (B, D). Boxed area (A, B) shown at higher magnification (C, D). Original magnification: (A, B) ×100; (C, D) ×400.
