Direct effects of the extracts on the RT activity. HIV-1 virions were assayed for their RT activity in the presence of the extracts at 10 μg/ml. AZT-TP (5 μM) was included as a positive control. DMSO (0.1%) and phosphate-buffered saline (PBS) were included as the solvent control for the extracts and AZT, respectively. The RT reaction without any input HIV-1 virions was also included as an assay control. The data were mean ± SEM of triplicate experiments.