51.   Nine percent said they would have the fertilized eggs destroyed.

52.   One research team used cells from fertilized eggs that would otherwise have been discarded after treating infertile couples, and the other used cells from already aborted fetuses.

53.   One kind of master stem cell generates the infant from the fertilized egg and then, its living sculpture completed, disappears.

54.   Refining the understanding of a crucial step in early pregnancy, researchers have pinpointed the time frame in which a fertilized egg needs to implant itself into the uterus.

55.   Return, for a moment, to the fertilized chicken egg.

56.   Researchers could swap DNA from one fertilized egg to another, but they could go no further.

57.   Siamese twins are a rare event, occurring when a single fertilized egg fails to completely divide to generate identical twins.

58.   Stem cells develop during the first two weeks after a fertilized egg becomes an embryo.

59.   That first cell is the fertilized egg.

60.   Such technology could replace the current controversial method of extracting stem cells from fertilized eggs donated by fertility clinics.