Figure 5

Corticosterone levels in control and mutant male mice. Corticosterone levels were measured in plasma samples collected in the afternoon and the following morning in control and mutant mice (n = 8–9 per genotype). They were then subjected to restraint stress and plasma was collected and measured for hormones 20 min and 150 min after the stress. ap < 0. 001 versus afternoon levels; bp < 0.001 versus morning levels.