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The HR response to 4-AP compared to that following 3,4-DAP, and the effect of Ach synthesis inhibitor (hemicholinium-3) on the response to 4-AP. Arrows indicate the injection of 4-AP or 3.4-DAP. Significant responses (* within symbol) and group differences (* in brackets) at 1 (left of curves) and 25 min (right of curves) were located as indicated. *P < 0.025 after curve analyses.
