Vol. 204, No. 1, January 22, 2007. Pages 33–39.

Please note a typographical error appeared in the online early release html version of this article. The final html, pdf, and print versions appear correctly. For reference, the correction appears below.

In the second sentence of the Abstract, “CD4+CD25+” should have read “CD4+CD25.” The corrected sentence appears below:

“We have previously shown that CD4+CD25hi T reg cells isolated from patients with active rheumatoid arthritis (RA) have a defect in their ability to suppress proinflammatory cytokine production by CD4+CD25 T cells.”