Schneider H, Cai YC, Prasad KV, Shoelson SE, Rudd CE (April 1995). "T cell antigen CD28 binds to the GRB-2/SOS complex, regulators of p21ras". European Journal of Immunology. 25 (4): 1044–50. doi:10.1002/eji.1830250428. PMID7737275. S2CID23540587.
Evans EJ, Esnouf RM, Manso-Sancho R, Gilbert RJ, James JR, Yu C, et al. (March 2005). "Crystal structure of a soluble CD28-Fab complex". Nature Immunology. 6 (3): 271–9. doi:10.1038/ni1170. PMID15696168. S2CID23630078.
Carreno BM, Collins M (April 2002). "The B7 family of ligands and its receptors: new pathways for costimulation and inhibition of immune responses". Annual Review of Immunology. 20 (1): 29–53. doi:10.1146/annurev.immunol.20.091101.091806. PMID11861596.
Walunas TL, Lenschow DJ, Bakker CY, Linsley PS, Freeman GJ, Green JM, et al. (August 1994). "CTLA-4 can function as a negative regulator of T cell activation". Immunity. 1 (5): 405–13. doi:10.1016/1074-7613(94)90071-x. PMID7882171.
Schneider H, Cai YC, Prasad KV, Shoelson SE, Rudd CE (April 1995). "T cell antigen CD28 binds to the GRB-2/SOS complex, regulators of p21ras". European Journal of Immunology. 25 (4): 1044–50. doi:10.1002/eji.1830250428. PMID7737275. S2CID23540587.
Evans EJ, Esnouf RM, Manso-Sancho R, Gilbert RJ, James JR, Yu C, et al. (March 2005). "Crystal structure of a soluble CD28-Fab complex". Nature Immunology. 6 (3): 271–9. doi:10.1038/ni1170. PMID15696168. S2CID23630078.
Carreno BM, Collins M (April 2002). "The B7 family of ligands and its receptors: new pathways for costimulation and inhibition of immune responses". Annual Review of Immunology. 20 (1): 29–53. doi:10.1146/annurev.immunol.20.091101.091806. PMID11861596.
Walunas TL, Lenschow DJ, Bakker CY, Linsley PS, Freeman GJ, Green JM, et al. (August 1994). "CTLA-4 can function as a negative regulator of T cell activation". Immunity. 1 (5): 405–13. doi:10.1016/1074-7613(94)90071-x. PMID7882171.
Schneider H, Cai YC, Prasad KV, Shoelson SE, Rudd CE (April 1995). "T cell antigen CD28 binds to the GRB-2/SOS complex, regulators of p21ras". European Journal of Immunology. 25 (4): 1044–50. doi:10.1002/eji.1830250428. PMID7737275. S2CID23540587.
Evans EJ, Esnouf RM, Manso-Sancho R, Gilbert RJ, James JR, Yu C, et al. (March 2005). "Crystal structure of a soluble CD28-Fab complex". Nature Immunology. 6 (3): 271–9. doi:10.1038/ni1170. PMID15696168. S2CID23630078.