FIG. 4.

(A and B) CEMx174 cells were infected with equal reverse transcriptase units of wt NL4-3 (A) and NL4-3/Udel (B) virus stocks produced in 293T cells as described in the legend of Fig. 3. On day 5 after infection cells were pulse-labeled as described in the legend of Fig. 3, with the addition of BfA during the pulse and chase at 5 μg/ml. A representative result is shown. The position of molecular weight standards is shown on the left. (C) Graph comparing the levels of the immature form of BST-2 from cells infected by wt HIV-1 (closed circles) and HIV-1/Udel (open circles). Plotted data are derived from three independent experiments. Error bars represent standard errors of the means.