title: Invited commentary.
authors.affiliation: Division of Cardiothoracic Surgery, University of California, San Diego, San Diego, CA 92103-8892, USA. pthistlethwaite@ucsd.edu
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Thistlethwaite
mesh_terms: D049109:Cell Proliferation; D002478:Cells, Cultured; D006801:Humans; D007231:Infant, Newborn; D032383:Myocytes, Cardiac / Q000166:cytology / Q000502:physiology*; D012680:Sensitivity and Specificity; D013234:Stem Cells / Q000166:cytology / Q000502:physiology*