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Wing morphology associated with introgressions and F1 hybrids. Wings were taken from males of: (a) D. melanogaster Oregon-R; (b) introgression heterozygotes; (c) introgression homozygotes; (d) D. simulans C167.4; (e and f) F1 hybrids rescued by the lethal hybrid rescue mutations, Lhr and Hmr (13, 14), respectively.
