AUTHOR=Zhang Yuelin , Liao Songyan , Fu Qingling , Hamrick Mark TITLE=Editorial: Mesenchymal Stem Cell Senescence and Rejuvenation JOURNAL=Frontiers in Cell and Developmental Biology VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2021.772476 DOI=10.3389/fcell.2021.772476 ISSN=2296-634X