Genetic deletion of CYP1A1 increases systolic and diastolic BP, and reduces HR. (A) 24 h mean systolic and diastolic BP, (B) 24 h mean HR, (C) Hourly systolic BP over a 24 h light/dark cycle, (D) Hourly diastolic BP over a 24 h light/dark cycle, (E) Activity over a 24 h light/dark cycle, and (F) Difference in MAP between nighttime and daytime, as measured by radiotelemetry. Data represent mean ± SEM. Data in A, B, and F were analyzed by Student’s t-test; *p < 0.05, and in C, D and E by two-way, repeated measures ANOVA, using post hoc Holm-Sidak comparisons; *p < 0.05 (n=7/genotype).