AUTHOR=Aydar Ebru , Cobos Enrique J. , Maurice Tangui , Murell-Lagnado Ruth D. , Safrany Stephen T. TITLE=Editorial: Sigma Receptors JOURNAL=Frontiers in Pharmacology VOLUME=11 YEAR=2020 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2020.590519 DOI=10.3389/fphar.2020.590519 ISSN=1663-9812