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Biphasic responses of the rabbit anococcygeus muscle elicited by EFS (50 V, 0.3-ms pulse duration, 5 Hz) for 5 s, 1 min, 2 min (A), and 10 min (B) after treatment with histamine (0.5 μM) in control conditions and for 10 min in the presence (C) of l-NOARG (100 μM). EFS and l-NOARG are indicated by separate horizontal bars. The mechanogram is an original recording of the responses and is representative of all experiments in this series (n = 8).
