Rev, that is required for the expression of the viral structural proteins and, hence, for viral
replication. The Rev protein acts posttranscriptionally to induce the sequence-specific
nuclear export of unspliced HIV-1 mRNA species that are otherwise excluded from the cell
cytoplasm. We have used site-directed mutagenesis to identify two distinct regions of the HIV-
1 Rev protein that are required for in vivo biological activity. The larger and more N-terminal …