This volume brings together a plethora of protocols and experimental methods used by scientists to study calpains, their inhibitors, and their substrates. It also explores bioinformatic approaches to calpain substrate identification. The chapters in this book are divided into five parts and cover topics such as production and purification of calpains; determination of calpain localization, expression, and activity; identification of calpain-activated protein function; interrogation of calpastatin; and manipulation of calpain expression. 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. Cutting-edge and practical, Calpain: Methods and Protocols is a valuable resource for researchers and scientists who want to learn more about this developing field, and get inspired to make new discoveries that will aid in diagnosing and treating calpain-related diseases.