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Maximum a posteriori phylogenetic tree of 40 CRF12_BF sequences from Argentina comprising the vpu gene and the 5′ end of the env gene. The precise day of sampling is given in the sequence identifier of each viral isolate. For isolate DIARG71/Jun2003, the exact day of sampling was unavailable so the mid-month date of 15 June was chosen to minimize error. In all cases, tip times correspond to the dates of virus sampling.
