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Figure 1. Abdominal pigmentation in D. melanogaster. Ter, tergite; St, sternite; A5–A7, abdominal segments 5–7, respectively. (A) Male: note the solid black pigmentation of A5 and A6. A7 is rudimentary and lacks a tergite. (B) A dark female, similar to the darkest phenotype seen in our sample. Note the complete pigmentation of A6. (C) A lighter female, similar to the lightest phenotype seen in our sample. Note the partial pigmentation of A6.