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. Author manuscript; available in PMC: 2011 Jun 20.
Published in final edited form as: Virology. 2010 Apr 9;402(1):135–148. doi: 10.1016/j.virol.2010.03.009

Figure 1. Coreceptor use on U87 indicator cells by HIV-1 pseudotype viruses.

Figure 1

U87 indicator cells expressing only CD4, CD4 and CCR5, or CD4 and CXCR4 were infected with HIV-1 luciferase reporter viruses pseudotyped with primary isolate envelopes (C2, DR, NR), prototype R5X4 envelopes (89.6, DH12 or R3A), R5 (Bal or JRFL) or X4 envelopes (Tybe) as controls. Three days later, infection levels were determined by measuring luciferase activity in cell lysates. The results are expressed in relative light units (RLUs) and represent means +/- standard error (SEM) for two experiments performed in triplicate.