41.   By properly nurturing embryonic stem cells, experts believe they can grow new cells to restore ailing organs in chronically ill patients.

42.   Dr. Jerry Hall of George Washington University announced last year that he and fellow researchers removed cells from flawed human embryos and grew those cells into new embryos.

43.   Experts believe that by properly nurturing embryonic stem cells, they can grow new cells to restore ailing organs in chronically ill patients.

44.   Growing these cells, however, requires the death of a human embryo.

45.   However, researchers hope that they will eventually be able to develop and harvest stem cells from such embryos to grow replacement cells.

46.   Researchers earlier had isolated stem cells from human embryos or from aborted fetuses, and grew the cells in a lab.

47.   Scientists believe they can learn to direct the development of embryonic stem cells in order to grow mature cells or tissues that could be used to treat disease.

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

49.   Some patients with failing livers recover after the organ spontaneously grows new cells, he said.

50.   The cells had been grown in a laboratory from immature pig kidney cells.