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. 2009 Oct 7;4(10):e7366. doi: 10.1371/journal.pone.0007366

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Khiabanian 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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Left: Considering the 150 strains in the dataset, NA, HA, and PB1 present a higher diversity than the rest. Right: When the dataset is limited to the classical H1N1 strains isolated in the 70's, 80's, and 90's, which fixes the HA and NA variations in the population, shows a higher diversity in PB1 than the rest of the segments.