The occurrence of tri-iodothyronine as the only circulating thyroid hormone.
D006042:Goiter / Q000097:blood*; D006801:Humans; D013963:Thyroid Hormones; D014284:Triiodothyronine / Q000097:blood*
D013963:Thyroid Hormones; D014284:Triiodothyronine
GOITER/blood; TRIIODOTHYRONINE/blood