KRECs per 10⁶ cells at the timepoint of stopping ATD and 6-10 weeks later in 15 of the Graves’ disease patients that relapsed (A) and 42 of the patients that remitted (B) at 12 months. Lines are stratified by change in KRECs; decrease (2-dashed), increase (solid), and stable (dotted). ATD, antithyroid drug; KRECs, Kappa-deleting recombination excision circles.