Neuropilin 1 is expressed on thymus-derived natural regulatory T cells, but not mucosa-generated induced Foxp3+ T reg cells. by Weiss, J, Bilate, A, Gobert, M, Ding, Y, de Lafaille, C, Parkhurst, C, Xiong, H, Dolpady, J, Frey, AB, Ruocco, MG, Yang, Y, Floess, S, Huehn, J, Oh, S, Li, M, Niec, R, Rudensky, A, Dustin, M, Littman, DR, Lafaille, J