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Type 1: subtype G is a circulating recombinant form. J Virol 2007, 81:8543?551.doi:10.1186/1743-422X-10-29 Cite this article as: Tongo et al.: Characterization of HIV-1 gag and nef in Cameroon: further evidence of extreme diversity at the origin of the HIV-1 group M epidemic. Virology Journal 2013 10:29.Submit your next manuscript to BioMed Central and take full advantage of:?Convenient online sub