31.   The findings still leave researchers seeking answers to a number of crucial questions about the origin of the new heart muscle cells Anversa identified.

32.   The human angioblasts generated blood vessels within the damaged rat hearts and prevented the overgrown heart muscle cells from dying.

33.   The stem cells would then be cultured to grow into self-sustaining colonies and treated with various chemicals to turn into different types of tissue like nerves or heart cells.

34.   The stem cells, for instance, conceivably could be grown into nerve cells, heart cells and other types of cells for use in transplants.

35.   They also found evidence that Herceptin combined with a common class of chemotherapy drugs can damage heart cells.

36.   While preliminary results from these experiments appear promising, success might be enhanced if researchers could get the growth-promoting genes into a higher proportion of heart cells.

37.   A team of American and Italian researchers demonstrated last year that heart muscle cells multiply after a heart attack.

38.   Chiu said the new tissue quickly began to work with the original heart cells, beating in unison.

39.   Cultured stem cells, scientists say, could produce new heart cells, or new insulin-producing cells for the treatment of diabetes.

40.   Heart cells regenerate every few days.