Klotho is the latest edition of a series first published in 1943 on Vitamins and Hormones and the longest-running serial published by Academic Press. It provides up-to-date information on vitamin and hormone research spanning data from molecular biology to the clinic, with volumes focusing on a single molecule or on a disease that is related to vitamins or hormones that are interpreted broadly so that related substances, such as transmitters, cytokines, growth factors, and others can be reviewed.