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Pedigrees and thyroid function tests of the three families. (A, B, and C) Values are aligned under each subject symbol. TT4, total T4; TT3, total T3; TrT3, total reverse T3; FT4I, free T4 index. Abnormal values are in bold characters. Note that the blood sample from the proband of family C was obtained 5 days after interruption of L-T3 treatment. *The normal range for children younger than 10 years is 100–205 μg/dL. SBP2 alleles present in each individual are indicated.
