Sierra, S., Kaiser, R., Lübke, N., Thielen, A., Schuelter, E., Heger, E., Däumer, M., Reuter, S., Esser, S., Fätkenheuer, G., Pfister, H., Oette, M., Lengauer, T. Prediction of HIV-1 Coreceptor Usage (Tropism) by Sequence Analysis using a Genotypic Approach. J. Vis. Exp. (58), e3264, doi:10.3791/3264 (2011).