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| Modern Genetic Analysis Chapter 14. Regulation of Gene Transcription Transcription: Gene Regulation in Eukaryotes an Overview Figure 14-28. The Tab mutation. The fly on the left is a wild-type male. The fly on the right is a Tab / + heterozygous mutant male. In the mutant fly, part of the thorax (the black tissue) is changed into tissue normally found in the dorsal part of one of the posterior abdominal segments. The rest of the thorax is normal. (From S. Celniker and E. B. Lewis, Genes and Development 1, 1987, 111.)

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