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Fig. 1. The GheF screening method. Males of the indicated genotype were
treated with the chemical mutagen EMS as described in Materials and methods.
The mutagenized males were mated to the GMR-hid ey-FLP
(GheF), FRT80 tester females. F1 offspring of this cross
were screened for a modification, usually a suppression, of the
GMR-hid eye ablation phenotype. Suppressor mutants were recovered,
retested and established as balanced stocks. Only recessive suppressors were
maintained; dominant suppressors were discarded.