Figure 2From: Clock mutation affects circadian regulation of circulating blood cells Circadian variations in plasma corticosterone (CS) levels in Clock mutant mice. Open and filled circles indicate values from wild-type and Clock mutant mice, respectively. Open and solid bars represent lights on and off, respectively. Values represent means ± SEM (n = 4). Significant differences between genotypes are shown as **P < 0.01.Back to article page