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Fig. 7. The serotonin dose—response curve for repolarization time ({tau}-P2) showing means (horizontal bars) and S.E.M. (vertical bars) for each dose, and a least-squares fit logistic function for all data. The response saturated at 2.5 µmol l-1 g-1, the dose we used for further experiments. The mean serotonin-induced rise at saturating doses is approx. 2/3 that of the circadian rhythm. The dose—response curve for amplitude was not significant and is not shown. Filled triangles, saline controls; open triangles, 5-HT-dosed.