Fig. 6

Individual variability in liver and kidney entrainment to food. For each tissue in each mouse, the preferred phase and r value were calculated from the four phase measures completed in constant conditions. This was done both in food time and in circadian time. The two r statistics are plotted against each other. Points above the diagonal dotted line indicate that circadian time better predicts phase than food time. Points that fall in the gray-shaded area have a significant preferred phase (r > 0.82; p < 0.05; Rayleigh test for n = 4). Note: the liver and kidney with significant phase clustering by food time are not from the same mouse. Activity and tissue phases for the mouse with significant liver food time (empty circle on right) are shown in Additional File 1: Fig. S12A