(Thanks to NoCamels) Doctors at Hadassah Medical Center in Jerusalem noticed that cell tissue transplanted into the left atrial appendage of the heart in mice developed into local heart muscle tissue. The phenomenon – similar to that of embryonic stem cells – has major implications for cardiology.
http://nocamels.com/2013/05/researchers-stumble-upon-the-hearts-self-healing-ability/
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0059228