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. 2011 Oct 18;6(10):e25794. doi: 10.1371/journal.pone.0025794

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Liu et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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H12 represents a lineage combination with lineage 1 and lineage 2; H34 denotes a lineage combination with lineage 3 and lineage 4; H1234 indicates a lineage combination with all lineages. A: The nucleotide diversity was calculated by averaging the polymorphic site within the compared lineages. B: The average nucleotide diversity (per site per sequence) was computed.