AUTHOR=Klein Marieke , Fernàndez-Castillo Noèlia TITLE=Editorial: In Search of Mechanisms: Genes, Brains, and Environment in Aggressive Behavior JOURNAL=Frontiers in Psychiatry VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2021.643747 DOI=10.3389/fpsyt.2021.643747 ISSN=1664-0640