Reporter assays of the hiNOS promoter construct pGLNOSa in HTLV-I–infected and uninfected T-cell lines. Five micrograms of the pGLNOSa construct were transfected. Luciferase activity was normalized to protein content. The promoter activity is represented as fold induction relative to that of the HTLV-I negative control Jurkat. Data represent the mean ± SEM of three experiments.