This is the sixth set of Handbook of Porphyrin Science.This 5-volume set provides a comprehensive review of the most up-to-date research on porphyrin, heme and chlorophyll biochemistry, as well as applications to biomedicine and bio-inspired energy. In-depth coverage of topics along with perspectives on outstanding questions and future research directions by the authors make these volumes an essential resource for both beginning and advanced investigators in the field. It is also suitable for non-experts in porphyrin, who wish to have an overview of the fundamental discoveries and breakthroughs in the porphyrin arena related to medicine and bio-inspired energy.Bringing together the biochemistry of porphyrin-binding proteins and their clinical relevance and applications to medicine and renewable energy, this set provides readers with an integrated coverage of porphyrin biochemistry. At the same time, it challenges readers with new questions and perspectives of research regarding the role of porphyrin biochemistry in the future of medicine and renewable energy.