51.   Rapamune won approval Wednesday from the Food and Drug Administration as an addition to the drugs used to suppress the immune system in order to prevent rejection.

52.   Scientists wanted to show that animal cells can work in people without the use of drugs to prevent rejection of the cells, Aebischer said.

53.   Taking stem cells from bone marrow requires a painful needle extraction, and the donor must be very closely matched to the recipient to prevent rejection.

54.   The new stent is coated with Rapamune, usually used to prevent organ rejection in kidney transplants.

55.   Transplant patients must take drugs to suppress their immune systems and prevent organ rejection, and that makes them vulnerable to viruses.

56.   This would eliminate the need for ordinary transplants and avoid the use of drugs to prevent rejection of the new organ.

57.   While it prevents immediate rejection, antibodies still build up on the foreign sugar.

58.   Scientists wanted to show that animal cells can work in people withtout the use of drugs to prevent rejection of the cells, Doctor Patrick Aebischer said.

59.   The family also produces anti-cancer agents and immunosuppressants used to prevent rejection of transplanted organs.