A 49-year-old woman presented with symptoms of thyrotoxicosis for 2 years. She was diagnosed with Graves’ disease 10 years earlier. She intermittently takes carbimazole therapy since her diagnosis. On physical examination, violaceous, non pitting, indurated nodules were observed on the dorsa of her hands, distal forearms, and shins (left). A goiter (right, arrow) is also noted. Laboratory testing showed an undetectable thyrotropin level and elevated total and free thyroxine and triiodothyronine levels. Which antibody would be positive in this patient? *
