Cell surface molecules involved in peripheral tolerance: (A) B7 and CD28, (B) CD40 and CD40L, (C) CD 34 and CD51, (D) B7 and CD3
Answer is A. Ref Robbins 7/e p225 , Harrison 16/e p1907, Robbins 9/e p213 B7 is a type of peripheral membrane protein found on activated antigen presenting cells that, when paired with either a CD28 or CD152 surface protein on a T cell, can produce a costimulatory signal