41. Because egg cells , unlike sperm, don't freeze well, Dresser needs fresh eggs to make her frozen embryos. 42. That fertilized egg cell grows and divides. 43. Inside the ovary / ovaries are one or more ovules where the megagametophyte contains the egg cell . 44. The same process in people may require a human egg cell to reprogram the skin cell nucleus. 45. Because of problems with using human egg cells , Advanced Cell Technology has been working with cow eggs. 46. The PAHs activate a genetic receptor called Ahr and a gene called Bax in certain egg cells . 47. A typical embryo sac contains seven cells and eight nuclei, one of which is the egg cell . 48. They exposed 22 egg cells to chemicals that changed the concentration of electrically charged ions within them. 49. Dolly's creators began with 277 egg cells . 50. If the dividing egg cell were placed into a woman's uterus, it could develop into a baby.
