31.   His aim is to help women whose eggs can be fertilized but whose embryos inexplicably die before they are ready for implantation in the uterus.

32.   In the cloning process, instead of fertilizing donor eggs with sperm, ACT scientists chemically tricked eggs into dividing after replacing their DNA with cells from another person.

33.   IVF is, after all, a very delicate process, which only works if the sperm successfully fertilizes the egg inside the petri dish.

34.   Later, the sperm is used to fertilize eggs.

35.   Latching onto the organism, the dwarf male deposits its sperm to fertilize the eggs of the female within.

36.   Like a pregame ad of a heroic sperm beating its wriggling rivals to fertilize an egg, the theme is individuals marching to their own drummer.

37.   New studies show that a cannabis-like compound inhibits the ability of human sperm to fertilize an egg.

38.   Ms. Garber and her father, Dr. Howard Garber, a retired optometrist, selected a sperm donor from a sperm bank to fertilize her eggs.

39.   One advance that made the new work possible was the ability to fertilize an egg by injecting sperm directly into it.

40.   One doctor called Capron saying he thought that with more research on techniques, he could help women whose eggs could be fertilized but who always miscarried their fetuses.