The complement to The Rat Brain in Stereotaxic Coordinates, Chemoarchitectonic Atlas of the Rat Brain, Third Edition, features a single brain series of high-quality plates stained with eight different markers, extensively annotated and labelled throughout. Plates from the previous edition of Chemoarchitectonic Atlas of the Rat Brain have been re-scanned at high resolution and are shown in color. Labeled structures have been revised, corrected, and updated, providing users with a streamlined, up-to-date, and highly accurate compendium of chemical markers. Researchers with a need to understand the detailed organization of the rat brain as well as structure/function relationships will need this atlas and its array of stains.