Twenty copies of the UAS site drive expression of a Drosophila codon-optimised form of P1cre recombinase that is tagged at the C-terminal end with the Tag:PEST(mOdc) degradation signal.
Animals expressing P1\cre3xScer\UAS.T:Mmus\PEST1 under the control of Scer\GAL4elav-C155 show no obvious morphological or motility defects.