Optochemical Biology, Volume 624, the latest release in the Methods in Enzymology series, continues the legacy of this premier serial with quality chapters on a variety of topics, including Cell Lineage Tracing in Zebrafish Embryos with an Expanded Genetic Code, Optical Control of Tumor Induction in the Zebrafish, Optogenetic Control by Pulsed Illumination, Optimizing the Photocontrol of bZIP Coiled Coils with Azobenzene Crosslinkers: Role of the Crosslinking Site, Site-Directed RNA Editing in Vivo Can Be Triggered by the Light-Driven Assembly of an Artificial Riboprotein, In Situ Formation of an Azo Bridge on Proteins Controllable by Visible Light, and much more.