Identification of Bcl-6-dependent follicular helper NKT cells that provide cognate help for B cell responses. - Chang, P; Barral, P; Fitch, J; Pratama, A; Ma, C; Kallies, A; Hogan, J; Cerundolo, V; Tangye, S; Bittman, R; Nutt, S; Brink, R; et al. (Nature immunology, 2012)