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Amino acid alignment of functionally diverse env gene sequences. Full-length sequences were determined for the four R5 env clones (clones 10, 13, 14, and 23), one X4 env clone (clone 22), and one representative R5X4 env clone derived from this pool (clone 2). Sequences were aligned with that of the original R5X4 89.6 clone. R5 clones 13 and 14 had identical Env sequences.
