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FIGURE 1. Total 131I activity and PB131I activity per liter of serum on day 0 after radioiodine therapy in patients with nodular goiter. (A and B) Nine patients were pretreated with 0.01 mg of rhTSH (A), and 9 with 0.03 mg of rhTSH (B). The results for each rhTSH group were compared with those for 9 control patients. Mean value + SEM is given. {blacksquare} = total 131I activity in rhTSH-pretreated patients; {square} = total 131I activity in control patients; • = PB131I activity in rhTSH-pretreated patients; {circ} = PB131I activity in control patients.