AUTHOR=Pacini Simone , Petrini Mario TITLE=Editorial: In Search of In vivo MSC JOURNAL=Frontiers in Cell and Developmental Biology VOLUME=5 YEAR=2017 URL=https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2017.00060 DOI=10.3389/fcell.2017.00060 ISSN=2296-634X