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. 2019 Sep 26;11(10):898. doi: 10.3390/v11100898

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Time-resolved phylogenetic tree of the (a) S1, (b) E, (c) M, and (d) N genes of IBV using the Bayesian MCMC method (see Materials and Methods for further details). The MCC tree was constructed with 10% burn-in by Tree Annotator version 1.8.2 implemented in the BEAST software package. A change in branch color indicates a time change during the genotype’s evolutionary history. Numbers beside the branches are branching time. The scale bar represents the unit of time (year).

Time-resolved phylogenetic tree of the (a) S1, (b) E, (c) M, and (d) N genes of IBV using the Bayesian MCMC method (see Materials and Methods for further details). The MCC tree was constructed with 10% burn-in by Tree Annotator version 1.8.2 implemented in the BEAST software package. A change in branch color indicates a time change during the genotype’s evolutionary history. Numbers beside the branches are branching time. The scale bar represents the unit of time (year).