This volume covers current and emerging techniques for studying single-domain antibodies (sdAbs). Chapters guide readers through the biology and immunology of sdAbs in camelids and sharks, isolation of sdAbs, protein engineering approaches to optimize the solubility, stability, valency and antigen binding affinity of sdAbs, and specialized applications of sdAbs. Written in the format of the highly successful Methods in Molecular Biology series, each chapter includes an introduction to the topic, lists necessary materials and reagents, includes tips on troubleshooting and known pitfalls, and step-by-step, readily reproducible protocols. Authoritative and cutting-edge, Single-Domain Antibodies: Methods and Protocols aims to be a useful, practical guide to help researchers further their studies in this field.