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. 2023 Mar 22;9(12):eabq3713. doi: 10.1126/sciadv.abq3713

Fig. 6. Evidence of localized introgression of the Alba locus.

Fig. 6.

Across the genome, relative node depth (RND) is expected to show a consistent pattern of divergence between species reflecting time since their common ancestor, while RND is expected to be lower in regions of recent introgression between species. (A) RND between all sequenced Alba C. eurytheme (California, USA) and C. philodice (Maryland, USA) and (B) C. pelidne and C. canadensis. RND was estimated in nonoverlapping windows of 10 kbp along the scaffold using C. crocea (Eurasia) as an outgroup species. The BarH1 gene is indicated with a blue box, and the Alba locus is indicated by a green and red box, as per Fig. 3C. The lower 5% of RND values is shown for scaffold 2 [length = 10.9 Mbp; dashed lines at (A) 0.258 and (B) 0.457]. Notice that while RND fluctuates across the entire scaffold in both comparisons, we observe a significant drop in RND near the Alba locus, but not the BarH1 gene, consistent with a more recent shared origin of the former.