A powerful new tool is available for neuroscience investigation into brain development, the mechanisms of memory and learning, and the role of brain dysregulation in neuropsychiatric diseases (lat. Morbo neuropsychiatric) like addiction, depression, schizophrenia and Alzheimer’s disease. This molecular biology tool - developed and validated by the University of Alabama at Birmingham researchers - is able to selectively and robustly turn on genes in neurons. It has been delivered to neurons growing in a dish, and more importantly, it has also been delivered to brain neurons in living adult rats. The tool can increase the expression of a single gene or the expression of multiple genes at the same time, and the amount of increased gene expression can be controlled.