''The Facts On File Dictionary of Biotechnology and Genetic Engineering, Third Edition'' is an important reference tool for students, teachers, physicians, science and technical writers, and anyone looking for a concise source of current information in this fast-breaking field. This dictionary provides readers with access to the basic vocabulary of modern biotechnology and genetic engineering so that even those with an elementary knowledge of basic biology and biochemistry will be able to follow any developments in this field. This dictionary has been updated and expanded to account for the new developments and new terminology in the rapidly evolving areas of genomics, bioinformatics, cell signaling, and molecular medicine. In addition, a number of biochemical terms pertaining to recent advances in medicines for the treatment of viral diseases, mental illness, cholesterol metabolism, plant engineering, and stem cell research have been included as well. New and revised entries include: Atomic force microscopy (AFM); Epistasis; Kallmann syndrome protein; Marfan syndrome; Oncostatin M (OSM); Progeria; RAG proteins; Thromboxanes; Trimethoprim; and, Vascular endothelial growth factor.