Helper T cell plasticity: impact of extrinsic and intrinsic signals on transcriptomes and epigenomes. - Bonelli M; Shih HY; Hirahara K; Singelton K; Laurence A; Poholek A; Hand T; Mikami Y; Vahedi G; Kanno Y; O'Shea JJ (Current topics in microbiology and immunology, 2014)