TLR9-mediated dendritic cell activation uncovers mammalian ganglioside species with specific ceramide backbones that activate invariant natural killer T cells by Paget, C, Deng, S, Soulard, D, Priestman, D, Speca, S, von Gerichten, J, Speak, A, Saroha, A, Pewzner-Jung, Y, Futerman, A, Mallevaey, T, Faveeuw, C, Gu, X, Platt, F, Sandhoff, R, Trottein, F