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Neighbor-joining phylogeny of SIVsmE660 uncloned isolate-derived env genes, cloned isolate env genes, and T/F env genes. Uncloned isolate env sequences are represented in black, cloned isolate env sequences in blue, and T/F env sequences in red. The isolate clones with asterisks were nonfunctional in cell entry assays. The SIVsmE660 isolate env sequences displayed 1.61% maximum within-env diversity. The scale bar represents 0.1% diversity.
