You have 5 billion cells called myocites , all beating in synchrony , in a perfectly coordinated manner , to maximize the heart 's pumping ability . Dr. Roberto Bolli directs the Institute of Molecular Medicine in Louisville . In 2009 , Louisville hosted the SCIPIO trial , which used stem cells to replace tumors . Patients in the trial showed dramatic improvements in their organs ' abilities .
Dr. Roberto Bolli directs the Institute of Molecular Medicine in Louisville . In 2009 , Louisville hosted the SCIPIO trial , which used stem cells to replace tumors . Patients in the trial showed dramatic improvements in their organs ' abilities .