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Sst2 immunohistochemistry showing internalized sst2 receptors at high magnification in tumors from three octreotide-treated patients (A–C) as compared with a tumor (D) of an untreated patient showing membranous staining. For comparison, E shows internalized sst2 in an AR42J tumor of a rat treated with 0.21 mg [Tyr3] octreotate given iv 1 h before being killed. Bars, 0.01 mm.
