Following publication of our recent article 1, it was brought to our attention that there are errors in Figure 5b and Supplementary Table 2.

The corrected Figure and table are given here as Figure 1 (a corrected version of Figure 5b 1) and Table 1 (a corrected version of Supplementary Table 2 1).

Naive CD4⁺ T cells from DBA/1J mice were stimulated with anti-CD3 plus anti-CD28 antibodies. On days 2 and 3, the cells were transduced with retroviral constructs: vector (Mig), FoxP3 (Mig-FoxP3), or FoxP3 with Bcl-xL (Mig-Bcl-xL-2A-FoxP3). On day 6, green fl uorescent protein-positive (GFP⁺) T cells were sorted and prepared for adoptive cell transfer. CIA was induced in male DBA/1J mice (>4 months old) by one (day 0) intradermal immunization in the base of the tail with 100 μg of bovine type II collagen in complete Freund's adjuvant, containing 5 mg/mL killed Mycobacterium tuberculosis (H37Ra). On day 15 after the immunization, the mice received transduced GFP⁺ cells (2.5 × 10⁶ per mouse, six mice per group). In the following days, the arthritis clinical score was evaluated by examining the paws and using a 4-point scale: 0, normal paw; 1, minimal swelling or redness; 2, redness and swelling involving the entire forepaw; 3, redness and swelling involving the entire limp; 4, joint deformity or ankylosis or both. Values are the mean ± standard error of the mean of data obtained in three experiments, and in each experiment, six mice per group were used.