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. 2018 Jan 3;7:e32273. doi: 10.7554/eLife.32273

Figure 9. The evolution of male-specific pigmentation required the gain of a regulatory linkage between Bab and the newly evolved body element CRE controlling yellow expression.

Figure 9.

(A) An alignment of the Bab-bound sequences in the SM4 (site 1) and SM10 (site 2) regions and for the two previously identified binding sites for Abd-B in the yBE0.6 CRE (Jeong et al., 2006). ‘Node 1’ on the phylogeny indicates the most recent common ancestor suspected to have possessed the derived male-specific pattern of pigmentation. Time scale shown is in millions of years ago. Bold capital letters indicate the bases bound by the transcription factor in the D. melanogaster CRE, and those which are conserved in the orthologous regions for related species. (B) Model for the derivation of a dimorphic pigmentation trait where dimorphic pigmentation required the evolution of a dimorphic Bab expression and the gain of a regulatory linkage between Bab and yellow through gains of binding sites in the body element CRE.