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Plasma concentrations of norepinephrine (A and B) and epinephrine (C and D) before (BL) and after iv administration of glucagon (GLUC) in patients with VHL- (A and C) and MEN 2-associated (B and D) pheochromocytomas. Data are shown as means ± SE. *P < 0.0002, increases in plasma concentrations of norepinephrine or epinephrine after GLUC; †P < 0.0001, larger responses of plasma norepinephrine or epinephrine to GLUC in MEN 2 patients than in VHL patients.
