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Median wheel revolutions per minute in response to 10 flashes with differing inter-flash intervals (IFI; 0.5 s, 1 s, 4 s, 8 s, 16 s and 30 s correspond to the different IFIs) by WT, rd/rd and OPN4−/− mice. Animals experiencing the CON condition received no light during the test interval; those in the 5 min condition received a single 5 min light pulse.
