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Time-of-day-dependent mRNA expression in the heart. The rats were euthanized 4 h before each ZT. The ZT 24 was double plotted as ZT 0. A–E) Expression of Dio1, Dio2, Thra1, Thra2, and Thrb1, respectively, normalized by Cyclophilin mRNA molecules and presented as absolute values of means ± SEM. One-way ANOVA, P<0.05 for time main effect in A. n=5/ZT/group. ZT=Zeitgeber Time.
