Differential immunogenicity of HIV-1 clade C proteins in eliciting CD8+ and CD4+ cell responses. di Ramduth, D, Chetty, P, Mngquandaniso, N, Nene, N, Harlow, J, Honeyborne, I, Ntumba, N, Gappoo, S, Henry, C, Jeena, P, Addo, M, Altfeld, M, Brander, C, Day, C, Coovadia, H, Kiepiela, P, Goulder, P, Walker, B