Fig. 6From: Shell neurons of the master circadian clock coordinate the phase of tissue clocks throughout the brain and bodyThe amplitude of AVP expression in the SCN is decreased by long day photoperiods. Double-plotted rhythms of PER2 and AVP expression measured in the SCN with immunohistochemistry. White and black bars on the abscissa represent lighting conditions. n = 4–8/time-point/photoperiod. *LD12:12 versus LD20:4, LS Means Contrasts, P <0.006. Cosinor analyses of PER2 and AVP rhythms are in Additional file 1: Table S4Back to article page