Cells were transfected with wt HIVgpt (wt HIV) or the indicated constructs and either untreated or treated with 1 μM PMA or PDB. At 72 h post-transfection, cell and VLP samples were collected, subjected to SDS-PAGE and anti-HIVCA immunoblotting. Cellular PrGag and VLP PrGag plus CA levels were quantitated densitometrically, raw release levels ([VLP PrGag + CA]/[Cell PrGag]) were calculated and are shown, normalized to untreated wt HIVgpt release levels. Results derive from one (wt HIV + PDB; PKCCBD-GFP-Gag + PDB), two (wt HIV + PMA; HIVgpt-MAGFP), three (PCKCBD-GFP-Gag + PMA), or four (GFP-AKTPH-Gag; GFP-PLCPH-Gag; PKCCBD-GFPGag) separate experiments. Standard deviations are as shown.