Introgression in the Drosophila subobscura--D. Madeirensis sister species: evidence of gene flow in nuclear genes despite mitochondrial differentiation.

However, this result must be interpreted with caution as we detect an overall trend toward negative Tajima's D in many nuclear genes as well, which is consistent with purifying selection and/or population expansion (Fu 1997 ; Fay and Wu 1999 ; Gordo et al. 2002 ; Table S1 ).

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