AUTHOR=Battaglia Maria Rita , Di Fazio Chiara , Battaglia Simone TITLE=Activated Tryptophan-Kynurenine metabolic system in the human brain is associated with learned fear JOURNAL=Frontiers in Molecular Neuroscience VOLUME=16 YEAR=2023 URL=https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2023.1217090 DOI=10.3389/fnmol.2023.1217090 ISSN=1662-5099