Researchers have found a way to calm fears with a drug that alters brain chemistry and help in understanding people at risk of anxiety disorders including those suffering post-traumatic stress disorder (PTSD). What is most compelling is our ability to translate first from mice to human neurobiology and then all the way out to human behaviour said Ahmad Hariri neurobiologist at the Duke Institute for Genome Sciences & Policy. That kind of translation is going to define the future of psychiatry and neuroscience.The common thread in their studies is a gene encoding an enzyme called fatty acid amide hydrolase or FAAH.