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Embryonal carcinoma cell lines (F9 EC and P19 EC) were stably transfected with 1.8 kb promoter sequence of RARβ2 coupled to the lacZ gene as a system for measuring active retinoids. These stable transfectants, designated F9-1.8 and P19-1.8, were used as reporter cell lines to investigate different retinoids for their ability to activate the reporter gene. F9-1.8 cells showed similar EC 50 ...
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