This volume brings together cutting-edge laboratory protocols to characterize the novel fluorescent proteins (FPs) and approaches based on fluorescent proteins that aim to answer some of the key cell biological questions. The book covers topics ranging from the database of fluorescent proteins to their characterization and adaptation to a wide range of biological systems. Written for the highly successful Methods in Molecular Biology series, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step and readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls.