The P{EPgy2} element present in the P{EPgy2}PdfrEY11851 insertion has been replaced with a P{GawB} element.
pdfrEY11181-GAL4/pdfr5304 flies display poor rhythmicity in constant dark conditions.
Expression of pdfrScer\UAS.cMa using Scer\GAL4Pdfr-EY11181-GAL4 in a pdfr5304/pdfrEY11181-GAL4 background strongly rescues the reduced rhythmicity phenotype seen in constant dark conditions.