Biochemical Pathways provide an overview of the chemical reactions of cells in various species and organs. Dr. Michal first compiled the Pathways Chart in 1965 and has been fine-tuning it ever since. There is also a live online version at http://biochemical-pathways.com/ This file is a snapshot from the download available from https://www.roche.com/sustainability/philanthropy/science_education/pathways/pathways-ordering.htm every now and then -- Roche takes the download link down whenever they have new printed copies available, and puts it back up when they are out of stock. Compare e.g. in the wayback machine: http://wayback.archive.org/https://www.roche.com/sustainability/philanthropy/science_education/pathways/pathways-ordering.htm About the license: Roche says on their web site "We believe all people should have access to important scientific information to help their research and education. [...] Roche provides copies as a free service to the public; [...]"