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Fig. 4. Absolute changes in (A) heart rate (fH) and (B) mean arterial pressure (a) in response to atropine. Asterisks represent significant (P<0.05) drug responses, and a bar that overlaps different percentages of incubation indicates that the values are statistically similar between these periods. Data are presented as means ± 1 S.E.M. N=5 for each incubation period studied.