T-Cell CostimulationSharpe, ArleneAbbas, Abul.Author informationHarvard Medical School, Boston, MA 02115 (Sharpe)University of California, San Francisco, San Francisco, CA 94143 (Abbas)New England Journal of Medicine 355(24):p 2595, December 14, 2006.Copyright © 2006 Massachusetts Medical Society. All rights reserved.