11.   Sussman said this was good but not conclusive evidence that the stem cells can make working heart tissue.

12.   The activated stem cells homed in on the damaged heart tissue and grew into new heart muscle, enabling most of the animals to survive the heart attack.

13.   The cells would home in on damaged heart tissue, and repair it.

14.   The damaged heart tissues send out signals, called receptors, that attract the VEGF and FGF that our bodies normally produce.

15.   The concept has been demonstrated in repairing heart tissue in mice and is considered to have enormous clinical promise.

16.   The fault has caused huge problems for cardiologists because the lead which connects the pacemaker to the heart is embedded in the heart tissue.

17.   The realization that some apparently dead heart tissue is actually viable is forcing doctors to rethink how they treat heart attack victims.

18.   The postage stamp-sized patches of heart tissue grew onto the cow hearts.

19.   The target can be cells in the pancreas, the membrane lining of knuckles and other joints, a brain protein, skin cells or heart tissue.

20.   The traditional method for removing the leads consists of ripping them away from the heart tissue.