41.   Heart cells temporarily deprived of oxygen, such as when patients are put on a heart-lung machine during surgery, experience a sudden calcium overload.

42.   Now we know that heart cells divide.

43.   One team of researchers at Technion announced earlier this month that they had succeeded in growing the precursors of heart cells from embryonic stem cells.

44.   Scientists announced this month that they succeeded for the first time in growing heart cells from human embryonic stem cells.

45.   The heart cells can beat spontaneously, according to a report published in the Journal of Clinical Investigation.

46.   The Princess of Wales toured of the Victor Chang Cardiac Research Institute on Friday, meeting researchers and viewing heart muscle cells.

47.   The researchers grew genetically engineered mice that produced high levels of calcineurin in their heart cells.

48.   The researchers used chemicals to prompt the stem cells to change into highly specialized cells, including beating heart cells, muscle cells and brain cells.

49.   Unlike heart muscle cells, arm muscle cells can replicate.