The conserved phenylalanine residue in each FP4 motif of the Zzzz\actA fragment has been replaced by alanine.
Embryos expressing Lmon\actAAP4CAAX.Scer\UAS.T:Avic\GFP-EGFP,T:Hsap\M-HRAS under the control of Scer\GAL4elav.PLu do not show an ISNb bypass phenotype.