Expression of mib1Scer\UAS.cLa under the control of Scer\GAL4unspecified does not rescue any aspect of the mib21 embryonic phenotype.
Leaky, Scer\GAL4-independent expression of mib1Scer\UAS.cLa rescues the lethality seen in mib1EY97600/Df(3L)mib12 animals.