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Model predictions of plasma TSH (A), fractional induction of thyrocyte proliferation in the thyroid gland (B), and the ratio of the iodide concentration in thyrocytes to that in plasma (C) in X. laevis larvae. Predictions were generated under control conditions (solid line) and when TPO activity was arbitrarily inhibited by 95% (dashed line). C — concentration; TSH — thyroid stimulating hormone; PL — plasma; F — fractional; INDUC — induction; I — iodide; FC — follicular cell.
