AUTHOR=Carvalho Juliana Lott , Silva-Carvalho Amandda Evelin , Garcez Emãnuella Melgaço , Saldanha-Araujo Felipe TITLE=Commentary: Mesenchymal Stem Cells: A New Piece in the Puzzle of COVID-19 Treatment JOURNAL=Frontiers in Immunology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2021.682195 DOI=10.3389/fimmu.2021.682195 ISSN=1664-3224