Quantification of the scotopic and photopic ERGs of WT and MT1−/− mice recorded after 18 (CT 6) and 30 (CT18) h in DD.

<p>No differences in the amplitude of the a- and b-wave were observed in the scotopic ERGs of WT mice (A, B). The photopic ERGs show a circadian regulation in WT (C, Two-way ANOVA, P<0.01, N = 6–8 for each time-point) but not in MT₁^−/− mice (D, Two-way ANOVA, P>0.1, N = 6–8 for each time-point). White Circles = CT6; Black circles = CT 18.