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DMPP (A) or methacholine (MCh; B) infusion was applied to the adrenal gland in the absence (control, •) or presence of nifedipine (0.3 μm, ^; 1 μm, ▵; 3 μm, □). Symbols and vertical bars represent means ±s.e.m.** P < 0.01 compared with corresponding control response obtained before nifedipine treatment.
