Figure 2. Representative Free-Running Locomotor Rhythms before and during the Exposure to a Magnetic Field.

Actograms of two wild-type flies (A and B), one cry^b mutant (C) and one CRY-overexpressing fly (tim-gal4;uas-cry) (D) are depicted. All flies were exposed to blue light of 0.18 μW/cm² throughout the experiment and to a magnetic field of 300 μT during the second half of the experiment (indicated by gray areas). The free-running periods of 40% of wild-type flies lengthened (A) and 12% shortened (B) during exposure to the magnetic field. These effects were not observed in the majority of cry^b mutant flies (C). More than 60% of CRY-overexpressing flies exhibited arrhythmicity after the magnetic field (D).