Fig. 2. Effect of specific lactogenic hormones on the induction of ß-casein promoter activity by PhIP. Competent cultures of HC11-Lux cells were treated by different combinations of lactogenic hormones with and without 100 µM of PhIP as indicated, and the ß-casein promoter activity was analyzed using luciferase assay. No serum was added to the medium in this analysis. Values are the means ± SE of four determinations.