AUTHOR=Mulder Monique P. C. , Zhuang Zhihao , Liu Lei , Kessler Benedikt M. , Ovaa Huib TITLE=Editorial: Probing the Ubiquitin Landscape JOURNAL=Frontiers in Chemistry VOLUME=8 YEAR=2020 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00449 DOI=10.3389/fchem.2020.00449 ISSN=2296-2646