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HIF1α expression in von Hippel-Lindau-associated retinal hemangioblastoma (RH) in 3 patients. a HIF1A transcript is comparably upregulated in the RH of 3 patients. Photomicrographs of HIF1α protein expression in the RH cells in Patients 1(b), 2 (c) and 3 (d) (Avidin-biotin-complex immunohistochemistry, original magnification, ×200)
