The aim of this volume is to provide a comprehensive description of methods and protocols useful for the further study of T-helper cells. Chapters guide readers through T-helper cell recovery, molecular study, signal transduction pathways, T-cell manipulation and, last but not least, "e;omic"e; approaches. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and cutting-edge, T- Helper Cells: Methods and Protocols aims to be a useful practical guide to researches to help further their study in this field.