Dienz O, Eaton SM, Krahl TJ, Diehl S, Charland C, Dodge J, Swain SL, Budd RC, Haynes L, Rincon M. Accumulation of NFAT mediates IL-2 expression in memory, but not na?ve, CD4+ T cells. Proc Natl Acad Sci U S A. 2007 Apr 24; 104(17):7175-80.