AUTHOR=Issad Tarik , Lefebvre Tony TITLE=Editorial: O-GlcNAcylation: Expanding the Frontiers JOURNAL=Frontiers in Endocrinology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2019.00867 DOI=10.3389/fendo.2019.00867 ISSN=1664-2392