Abundant thyroid hormone is produced by human thyroid cells in culture.

Permanent hypothyroidism following surgical resection in a patient with Graves' disease requires levo-thyroxine replacement therapy for the rest of the patient's life . We mentioned' one therapeutic regimen for this patient in our first report on the autotransplantation of cryopreserved thyroid tissue in a patient with irreversible hypothyroidism. In this second report, we present the findings of our efforts to evaluate the tissue-cultured living cells from surgical specimens from the Graves' patient. Specific emphasis in the study was