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. 1998 Sep 21;188(6):1159–1171. doi: 10.1084/jem.188.6.1159

Figure 5.

Figure 5

Replication and syncytium-forming ability of SHIV variants. (A) Rhesus PBMCs were PHA-stimulated and infected with equal amounts of SHIV-89.6, SHIV-89.6*, SHIV-KB9ct, SHIV-KB9ecto, and SHIV-KB9. Cells were maintained in the presence of IL-2 for the duration of the experiment and an aliquot of the culture medium was removed every day for RT analysis. (B) Uninfected CEM×174 cultures (mock) were compared with cultures infected with SHIV-89.6, SHIV-KB9ecto, and SHIV-KB9 for the presence of syncytia. (C) COS-1 cells, transiently expressing the 89.6, KB9ct, KB9ecto, or KB9 envelope glycoproteins, were cocultivated with CEM×174 cells for 6 h at 37°C. The number of syncytia was scored and normalized to that observed for the parental 89.6 envelope glycoproteins. The mean values and SE derived from three independent experiments are shown.