AUTHOR=Lieber Richard L. , Domenighetti Andrea A. TITLE=Commentary: Muscle Microbiopsy to Delineate Stem Cell Involvement in Young Patients: A Novel Approach for Children With Cerebral Palsy JOURNAL=Frontiers in Physiology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2021.642366 DOI=10.3389/fphys.2021.642366 ISSN=1664-042X