CD43 is a murine T cell costimulatory receptor that functions independently of CD28.
Sperling AI, Green JM, Mosley RL, Smith PL, DiPaolo RJ, Klein JR, Bluestone JA, Thompson CB. CD43 is a murine T cell costimulatory receptor that functions independently of CD28. J Exp Med. 1995 Jul 01; 182(1):139-46.