PHA-induced HIV-1 production in the CD45RA⁺/CD4⁺ subset and conversion to CD45RO phenotype. RT assay of supernatants from HIV-infected CD45RA⁺/CD4⁺ and CD45RO⁺/CD4⁺ cultures that were PHA-stimulated 20 hours postinfection. RT activity was converted to a percent based on maximal activity of the CD45RO⁺/CD4⁺ culture. Insert A, 2-color FCA of PHA-stimulated, uninfected CD45RA⁺/CD4⁺ cells 7 days after stimulation. The number in each quadrant is the population percentage.