Now in its 6th edition, Paxinos and Watson's The Rat Brain in Stereotaxic Coordinates is the most-used reference of neuroscientists for the past twenty-five years. Both the illustrations and nomenclature of the atlas have become standard tools used by almost all research neuroscientists who deal with anatomy, physiology, or function in rodents. This new atlas combines the previous editions of Chemoarchitectonic Atlas of the Rat Forebrain and Chemoarchitectonic Atlas of the Rat Brainstem to provide users with a more streamlined compendium of the chemical markers in the rat brain along with the histological slides. The photographs in this new edition are presented one to a page in the forebrain and midbrain areas, two to a page in the hindbrain. Different chemoarchitectonic stains are displayed with labels identifying the structures of the brain, following the delineations and nomenclature of the Rat Brain in Stereotaxic Coordinates 6th edition. Every researcher with the need to identify neuroanatomical structures in the Rat brain will want this atlas to be able to browse different annotated histological slides.