FIG. 2.

(A) p24^gag antigen accumulation in the culture medium of HIV-1_NL4-3-infected NHOKs. The cell-free culture medium of HIV-infected NHOKs was removed at the times indicated for measurement of p24^gag levels by ELISA. The graph shows p24 levels versus the number of days postinfection, and the results are averages of three independent experiments. HI, heat-inactivated virus. (B) Experiment similar to that in panel A, except that the replication of HIV-1_NL4-3 was compared between NHOKs and PBLs by assaying p24 levels by the ELISA method. (C) Summary of p24 levels in T-lymphotropic NL4-3-, ELI-, dualtropic 89.6-, and CCR5-tropic Ba-L-infected NHOKs.