Cignal Retinoic Acid Response Element (RARE) Reporter Assay reported elevated retinoic acid receptor pathway activity after the treatment of all trans-retinoic acid (ATRA). CHO-K1 cells were transfected with RARE reporter, negative control, and positive control. After 16 hours, medium was changed to assay medium. After 24 hours, cells were treated with 1 µM all trans-rectinoic acid (ATRA) for 6 hours. Dual-luciferase assay was performed, and promoter activity values are expressed as arbitrary units using a Renilla reporter for internal normalization. Experiments were performed in triplicate and the standard deviation is shown.