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EGR1 mRNA (isotop labelled probe) in the SCN in wild type and PACAP deficient mice at late night light (ZT23) stimulated with 300 lux (A) or 10 lux (B) light intensity at ZT22. EGR1 mRNA amount is presented as group mean (± SEM, n = 8 animals) and results of wild type mice are shown in the black bars and PACAP deficient mice in the white bars. *** p<0.001, ** p<0.005, * p<0.05.
