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Variability of p17Gag (A) and p24Gag (B) B- and C-clade sequences, with reference to an amino acid sequence showing the most common residue at each position (HIV website [www.hiv-lanl.gov]). All database sequences available were used for the analysis except for B-clade p17Gag sequences; in this case, every fifth of 270 sequences derived in the United States was analyzed in order to compare variability in an equivalent number of B- and C-clade sequences.
