Editors   Breakthrough: Human Hearts Can Grow New Cells   4/20/2009 11:50:00 AM    
In the April 3 issue of the journal Science, a team from University of Toronto and University of Wisconsin-Madison announced their discovery that heart cells regenerate throughout a human lifetime, with a 1 percent annual turnover rate at age 25, falling to a 0.45 percent turnover rate at age 75.

Therefore, the human heart must have it's own stem cells.