Epigenetic modification of the PD-1 (Pdcd1) promoter in effector CD4+ T cells tolerized by peptide immunotherapy oleh Rhoanne C McPherson, Joanne E Konkel, Catriona T Prendergast, John P Thomson, Raffaele Ottaviano, Melanie D Leech, Oliver Kay, Stephanie E J Zandee, Claire H Sweenie, David C Wraith, Richard R Meehan, Amanda J Drake, Stephen M Anderton