The mouse is undoubtedly the most important and commonly used model system in research. This is increasingly the case in the study of brain function. The availability of genetically modified animals has boosted research in neuroscience, and the data being amassed needs a common neuroanatomical background to map to. The previous two editions of the Mouse Brain in Stereotaxic Coordinates have been the standard neuroanatomical atlases for the mouse for over a decade. The completely revised and updated 3rd edition features many improvements and upgrades.