On his son’s fourth birthday, Michael Prescott had his first heart attack. Prescott, who worked as a civil engineer designing bridges in Tennessee, was in his 30s, and until that day, he had appeared to be in excellent health. But within two years of that first heart attack, he had four more. His doctors, who were baffled by his repeated medical crises, decided that he needed a heart transplant. In 2001, he underwent the procedure in Nashville. But a few years later, he needed a kidney

Tag-uri: DNA