The present volume provides an overview on Human genome project, which offers gene therapy, drug therapy and prevention of genetic diseases. Since both plant and animal DNA is made of four nucleotides of adenine, thymine, guanine and cytosine, it is no wonder that secondary metabolites of the former (e.g. alkaloids, isoprenoids, flavonoids, glycosides, lignans etc.) become a drug for the latter. Thus reviews on diterpenes of Euphorbiaceae family, Glycyrrhizin, a ...