Driven by methodological success in identifying reliable lineage markers, regulatory T cells have quickly been recognized as the most numerous subset of immune regulators in the body with critical functions in a wide array of immune responses. In Regulatory T Cells: Methods and Protocols, experts in the field to offer a collection of current techniques to advance the study of regulatory T cells, including the use of the IL-2 receptor alpha chain and other markers, as well as the more recently desirable use of the transcription factor FoxP3. Divided into three sections, the book covers, in equal measure, in vitro, in vivo, and human studies. Written in the highly successful Methods in Molecular Biology (TM) series format, chapters include brief introductions to their respective subjects, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and key tips on troubleshooting and avoiding known methodological pitfalls. Authoritative and cutting-edge, Regulatory T Cells: Methods and Protocols distills the most vital current techniques through several years of optimization and standardization in order to allow reliable and reproducible use by both young and experienced cellular and molecular immunologists.