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Percentages of each (sub)subtype and CRF at each locus, West region. (a) gag, 2000–2001 vs. 2007–2008. (b) pol, 2000–2001 vs. 2007–2008. (c) env, 2000–2001 vs. 2007–2008. Statistically significant decrease (p < 0.05) is denoted by an asterisk.
