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Alignment of Env sequences for SIVmac239 and 239-ST1.2-32. The indicated Env domains are based on the locations of the corresponding domains in HIV-1 Env. Locations of putative N-linked glycosylation sites are indicated by black dots. Stop codons are indicated by asterisks. The recombinant SIVmac239 virus containing the 239-ST1.2-32 Env clone used in these studies did not include the stop codon at position 734 or the two downstream mutations.
