The expression of Kdm2UAS.EGFP under the control of either Scer\GAL4tim.PU or Scer\GAL4Pdf.PU leads to a significant increase in circadian period but does not seem to affect circadian rhythmicity in adult kept in constant darkness, as compared to controls. The same occurs if the expression is under the combined control of Scer\GAL4tim.PU and Scer\GAL80Pdf.PS.