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Subspecific origin and haplotype diversity of chromosomes 6 (left) and X (right). A) Subspecific origin. Colors follow the same conventions as in Figure 1. B-E) Phylogenetic trees for classical and wild-derived strains for two compatible intervals, one spanning positions 143,009,892-143,140,072 on chromosome 6 (C and D) and the other spanning positions 37,770,186-42,329,981 on chromosome X (E and F).
