RT Journal Article SR Electronic T1 Pillars Article: CD28 and CTLA-4 Have Opposing Effects on the Response of T Cells to Stimulation. The Journal of Experimental Medicine. 1995. 182: 459–465 JF The Journal of Immunology JO J. Immunol. FD American Association of Immunologists SP 3459 OP 3465 VO 187 IS 7 A1 Krummel, Matthew F. A1 Allison, James P. YR 2011 UL http://www.jimmunol.org/content/187/7/3459.abstract AB