Abstract
Mice lacking cryptochromes (mCry1-/- mCry2-/-) were kept in a 16h light, 8h dark, light-dark (16:8 LD) cycle and were given additional pulses of light of different brightness, starting 2h after dark onset and lasting for 1h. The suppression of wheel running during these light pulses (i.e., masking) was compared to that of wild types. No evidence of any decrement in the masking response to light was detected. As well as studying masking, minor bouts of activity occurring in the main light portion of a light-dark cycle were quantified. One possible explanation of such predark activity is that some damped endogenous process is spared in mCry1/mCry2 double-knockout mice. (Chronobiology International, 18(4), 613–625, 2001)
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