1.   And unlike other mammals, dogs excrete immature eggs from their ovaries, making it hard to obtain the mature eggs needed to start the cloning process.

2.   A mature raw egg hits the pan running and spreads by the second.

3.   His group is transferring nuclei from damaged cells into immature healthy eggs to find out whether they will then divide normally and form healthy mature eggs.

4.   It takes weeks to stimulate the development and release of mature eggs, and during that time, cancer treatments must be delayed.

5.   Oktay reported this week that he had implanted previously frozen human ovarian tissue into mice and was able to get the ovaries to ripen and give off mature eggs.

6.   The higher the estradiol level, the more likely a follicle contains a mature egg.

7.   They have just one set of chromosomes, like mature sperm or mature eggs.

8.   Unlike sperm, mature eggs are almost always ruined if they are frozen, so there are no egg banks.

9.   A mature egg contains only one set of each chromosome.

10.   But more important, the tissue appears to be functioning normally and has produced mature eggs and regulates the menstrual cycle.