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Nuclear and cytosolic 125I-T3/131I-T3 ratio or total 131I-T3 from pp6 cells after overnight incubation with 125I-T4 and 131I-T3. Proliferating (prolif) and differentiated (differ) pp6 cells were incubated in physiological concentrations of free 131I-T3 and 125I-T4 and treated with vehicle or 30 nM rT3 to block D2, as labeled (see Fig. 1 legend). Data are means ± SE of triplicates of 3 independent experiments. *P < 0.05, ***P < 0.001.
