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Genetic relatedness of all 36 functional env clones from the 89.6PI swarm, determined on the basis of the nucleotide sequences across a ∼600-bp V3-to-V5 region. The dendrogram was generated by using the Clustal method. Clones restricted to CCR5 or CXCR4 are indicated by R5 or X4 to the right of the clone number, while the rest of the env clones, for which no coreceptor usage designation is given, were R5X4.
