AUTHOR=Tejeda Hugo A. , Massaly Nicolas , Corder Gregory , Cahill Catherine M. TITLE=Editorial: Broadening our conceptual understanding of endogenous opioids in systems neuroscience JOURNAL=Frontiers in Systems Neuroscience VOLUME=17 YEAR=2023 URL=https://www.frontiersin.org/journals/systems-neuroscience/articles/10.3389/fnsys.2023.1212650 DOI=10.3389/fnsys.2023.1212650 ISSN=1662-5137