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A hypothetical model for the expansion of the NRU-NRV boundary into the pseudoautosomal region (PAR) in two steps, generating loci with two groups of NRU-NRV coalescence times (~3 MYA and ~1 MYA). Because we do not know the physical location of the genes in Groups 1 and 2, our genealogical data are also consistent with more complex scenarios involving more numerous expansions of smaller size, chromosomal inversions, or localized UV gene conversion events.
