AUTHOR=Lei Yuguo , Willerth Stephanie Michelle , Fernandes Tiago G. TITLE=Editorial: Stem Cell Systems Bioengineering JOURNAL=Frontiers in Bioengineering and Biotechnology VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/bioengineering-and-biotechnology/articles/10.3389/fbioe.2021.693107 DOI=10.3389/fbioe.2021.693107 ISSN=2296-4185