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Family pedigree showing the genotype and TFT results. Results are aligned with each symbol. Ages represent those at the time of blood sampling. Tx, thyroidectomy. Note that FT4I cannot be obtained in the complete absence of TBG. TT4, total T4; TT3, total T3; FT4I, free T4 index; Tg, thyroglobulin; TPO, thyroperoxidase; THRB and TRβ, thyroid hormone receptor beta.
