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Schematic diagram of genetic screen. The interaction between prune and Killer of prune eliminates male dysgenic progeny in the F0 and F1 generations (10). [HOP; w+], Hobo-element carrying the Δ2-3 transposase gene and the mini-white+ marker; [HSA1], second chromosome carrying three P[boss; ry+] elements (see Materials and Methods). Chromosomes from dysgenic F0 females shown in gray.
