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EGR1 mRNA (isotop labelled probe) in the SCN in wild type and PACAP deficient mice at early (ZT17) night light stimulated with 300 lux (A) and 10 lux (B) light intensity. EGR1 mRNA amounts are presented as group mean (± SEM, n = 8 animals) and wild type mice (controls) are shown in the black bars and PACAP deficient mice in the white bars. *** p<0.001, ** p<0.005, * p<0.05.
