Recombination rate variation shapes barriers to introgression across butterfly genomes.

Correlations between f d and both the ρ and crossover recombination rate are highly significant, even after thinning windows to reduce effects of serial correlation ( S2 Table ).

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While we did find a weak trend of reduced admixture in gene-rich regions, this is difficult to interpret because the recombination rate is also lower in gene-rich regions in these species.

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