Flies expressing en45.T:Ivir\HA1 in a homozygous en54 mutant background are fertile with no phenotypic defects aside from minor defects in the wing veins in the posterior compartment in some flies.
Expression of en45.T:Ivir\HA1 does not suppress the lethality seen in Df(2R)enE/Df(2R)en-SFX31 (inv en double mutants).
Expression of en45.T:Ivir\HA1 rescues the lethality seen in en54 mutant homozygotes.