Cytotoxic T lymphocyte antigen-4 (CTLA-4) regulates the size, reactivity, and function of a primed pool of CD4+ T cells.

Kuhns MS, Epshteyn V, Sobel RA, Allison JP. "Cytotoxic T lymphocyte antigen-4 (CTLA-4) regulates the size, reactivity, and function of a primed pool of CD4+ T cells." Proc. Natl. Acad. Sci. U.S.A.. 2000;97(23):12711-6.