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Firing rate rhythms of rat SCN neurons in vitro across two projected day–night cycles. Top panel, The delay evoked by GRP at ZT13 is similar on days 2 and 3 in vitro. Bottom panel, The advance evoked by GRP at ZT19 is similar on days 2 and 3 in vitro. In each panel, the solid dots represent the smoothed running mean firing rate in spikes per second.Filled and unfilled horizontal barsdepict projected night and day portions, respectively, of the projected 48 hr period.
