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V3 loop amino acid sequence alignment. The N-linked glycosylation site and amino acid positions 11 and 25 are marked by asterisks, and the tip of the V3 loop is underlined. The net charge, the CD4 count, and the ratio of HIV DNA in a CCR5-positive population to the HIV DNA in a CCR5-negative population are provided for each sequence. A reference subtype E sequence of TH253 is shown on the top.
