Book excerpt: This volume and its companion volume 360 introduce a new topic to the Methods in Enzymology series. They will cover, among other topics, imaging, screening, and diagnosis in biological systems. See key features for greater detail.Key Features* Optical instrumentation for imaging, screening and diagnosis in molecules, tissues, and cells* Development and application of optical probes and techniques for imaging and drug screening, protemics, genomics, and cellomics* Applications of biophotonics research to the understanding of mechanisms of cellular reactions and processes, investigating the structure and dynamics of biomolecular systems, screening and drug discovery, and diagnosis and treatment of disease