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FIGURE 6. Response of labeled cells specifically to self-dose received from intracellular decays of 131I. This was determined by taking ratio of labeled cell survival fraction to unlabeled cell survival fraction. Ratio is plotted both as a function of activity per labeled cell (bottom axis) and self-dose to labeled cell nucleus (top axis). Data are derived from 2 independent experiments in Figures 3A and 3B (•, 
). Error bars for ratios are derived from errors associated with survival fractions for labeled and unlabeled cells. Also shown is a least-squares fit of combined data from 2 experiments (solid line).
