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Figure 4


Fig. 4. Diurnal urea excretion (Jurea) in food-deprived Rivulus marmoratus exposed to an inverse photoperiod of 12 h:12 h dark:light (Series IV). White and black bars above the graph indicate periods of light and dark, respectively. Values are expressed as means ± s.e.m. (N=8). Jurea values followed a significant rhythm (F2,9=39.6, P=0.00003).