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. 2015 Sep 23;4(9):e57. doi: 10.1038/emi.2015.57

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Phylogenetic relationships of DENV-1 isolates based on the complete NS1 nucleotide sequences (1236 nt) of 57 isolates, including seven Guangzhou isolates. The red boxes represent 2014 Guangzhou DENV-1 strains. A maximum-likelihood tree was constructed using MEGA version 6, based on the Tamura-Nei model. Bootstrap resampling values are indicated at major nodes. The scale bar indicates the number of base substitutions per site.