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Inferred evolutionary history of contemporary Schizosaccharomyces pombe strains. An ancestral population diverged into two major clades, Sp (red) and Sk (blue), approximately 2,300 years ago (Jeffares et al. 2015). Recurrent hybridization upon secondary contact initiated around 20–60 sexual outcrossing generations ago resulted in the admixed genomes with a range of admixture proportions (bottom) prevailing today.
