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(Left) Bloated wings caused by the X-ray-induced delta-49 inversion. (Right) Schematic and camera lucida drawings of paired X chromosomes from the larval salivary gland of a Drosophila that was heterozygous for the X chromosome with the delta-49 inversion. (Left, Reprinted from Muller HJ. 1930. J Genet 20: 299–334; right, reprinted from Painter TS. 1934. Genetics 19: 448–469.)
