AUTHOR=Apergis-Schoute John , Burnstock Geoffrey , Nusbaum Michael P. , Parker David , Morales Miguel A. , Trudeau Louis-Eric , Svensson Erik TITLE=Editorial: Neuronal Co-transmission JOURNAL=Frontiers in Neural Circuits VOLUME=13 YEAR=2019 URL=https://www.frontiersin.org/journals/neural-circuits/articles/10.3389/fncir.2019.00019 DOI=10.3389/fncir.2019.00019 ISSN=1662-5110