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Rec."],"published-print":{"date-parts":[[2004,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Adult cardiac muscle is unable to repair itself following severe disease or injury. Because of this fundamental property of the myocardium, it was long believed that the adult myocardium is a postmitotic tissue. Yet, recent studies have indicated that new cardiac myocytes are generated throughout the life span of an adult and that extracardiac cells can contribute to the renewal of individual cells within the myocardium. In addition, investigations of the phenotypic capacity of adult stem cells have suggested that their potential is not solely restricted to the differentiated cell phenotypes of the source tissue. These observations have great implications for cardiac biology, as stem cells obtained from the bone marrow and other readily accessible adult tissues may serve as a source of replacement cardiac myocytes. 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