CD4 is associated with HLA?: (A) HLA 1, (B) HLA 2, (C) HLA 3, (D) All of them
Answer is B. Ans. is 'b' i.e., HLA 2 * MHC-II recognizes exogenous antigen (extracellular microbes, soluble proteins) and present it to CD4 helper T cells (MHC-II restricted).* MHC class I present antigen to cytotoxic CD-8 T cells (MHC-I restricted).