Figure 2.

Reconstructed ancestral nodes A16 and A13 were used to define D. melanogaster gene pairs with ancient linkage that were rearranged on the branch leading up to D. mojavensis, D. virilis and D. grimshawi

Weber and Hurst Genome Biology 2011 12:R23   doi:10.1186/gb-2011-12-3-r23
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