Liver Per1 expression displayed a main effect for epilepsy, F(1, 78) = 9.439; P < 0.01, a main effect for time, F(4, 78) = 6.193; P < 0.01, and a epilepsy by time interaction, F(4, 78) = 4.435; P < 0.01. Here, PER1 is linked to epilepsy.