TABLE 1.
Infectivity of the chimeric viruses
| Provirus | Infectious units/ng of p24a |
|---|---|
| R7Δtat | 0 |
| R7Htat | 836 |
| R7Btat-HTAR | 11 |
| R7Jtat-HTAR | 1,072 |
| R7Htat-BTAR | 3 |
| R7Btat-BTAR | 969 |
| R7Jtat-BTAR | 636 |
| R7Htat-JTAR | 4 |
| R7Btat-JTAR | 96 |
| R7Jtat-JTAR | 861 |
| R7Htat-H/BTAR | 783 |
| R7Btat-H/BTAR | 992 |
| R7Jtat-H/BTAR | 412 |
a
293T cells were transfected with the indicated proviral plasmid, and supernatants were collected after 48 h and assayed for p24. Equal amounts of p24 were used to infect U373-MAGI cells, and viral titers were determined by counting p24-positive cells by immunofluorescence as described in Materials and Methods.