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F2 lethal noncomplementation screen for additional KE1 alleles. Mutagenized yw; FRT(42D); ey-FLP males were mated to females bearing additional copies of ey-FLP. Single male F1 progeny, heterozygous for the newly induced mutations, were mated to KE1-1 females and the F2 progeny were scored for the absence of [FRT(42D)*/KE1-1] flies.
