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Cross section of an adult mouse heart grafted with fetal heart muscle cells isolated from transgenic mice. The nuclei of the fetal heart cells (black dots) were visualized with a stain specific for a nuclear enzyme. These engrafted cells are integrated with the host heart muscle. Such intracardiac grafting might be useful in repairing damaged heart muscle. See page 98 and the News story on page 31. [Digital image: Craig P. Wilson, Krannert Institute of Cardiology]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)