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. 2021 Aug 19;5(10):1367–1381. doi: 10.1038/s41559-021-01525-w

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© The Author(s) 2021

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Fig. 3 — a, Median TE insertions per genome. As the A. arenosa population is an autotetraploid outcrosser, four randomly chosen haploid A. arenosa subgenomes of A. suecica were combined to make a 4n A. suecica. A. suecica does not show an increase in private TE insertions compared with the ancestral species for either subgenome, and shared TEs constitute a higher fraction of TEs in A. suecica, reflecting the strong population bottleneck at its origin. b,c, Site-frequency spectra of non-synonymous SNPs, synonymous SNPs and TEs in the A. thaliana (b) and A. arenosa (c) subgenomes of A. suecica suggest that TEs are under purifying selection on both subgenomes. d, Three-dimensional histogram of a joint TE frequency spectrum for A. thaliana on the x axis and the A. thaliana subgenome of A. suecica on the y axis. e, Three-dimensional histogram of a joint TE frequency spectrum for A. arenosa on the x axis and the A. arenosa subgenome of A. suecica on the y axis. d and e show stable dynamics of private TEs in A. suecica and a bottleneck effect on the ancestral TEs (shared) at the origin of the A. suecica species.