the latest release in this ongoing serial, continues the legacy of this premier serial with quality chapters authored by leaders in the field. Chapters in this new release include Site-directed recombination (SDR) in vivo: a fast and reliable tool to unveil beneficial epistasis, Creation and application of amine oxidase with expanded substrate specificities from porcine kidney D-amino acid oxidase, Methods to assess correlation networks for engineering transketolase, Exploration of Enzyme Diversity by Integrating Bioinformatics with Microfluidics, Engineering lytic polysaccharide monooxygenases (LPMOs), Emulsion-based directed evolution of enzymes in yeast, and much more.