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. 2014 Aug 24;45(1):90. doi: 10.1186/s13567-014-0090-y

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© Di Nardo et al.; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Accumulation of nucleotide differences calculated from the putative root (HKN/12/91 isolate) for the Philippines database with time expressed in years. Size of the points increases with increased number of nt substitutions. Shaded area represents 95% confidence intervals for the fitted line.