11.   Some teams are experimenting with removing and reimplanting ovarian tissue.

12.   When the woman is ready to have her ovarian tissue returned, Fugger will thaw the strips of her ovary and replace the dimethylsulfoxide with water.

13.   While far from perfected, the technique of piggybacking ovarian tissue on another species could provide a way to generate female reproductive cells for endangered species in breeding programs.

14.   Young women left infertile due to cancer or other ailments may someday have children thanks to the experimental ovarian tissue transplant that Oktay performed.

15.   An experimental ovarian tissue transplant has worked and allowed a prematurely menopausal woman to ovulate and have a normal menstrual period, a doctor said Thursday.

16.   An experimental ovarian tissue transplant that may eventually allow women to turn back their biological clocks and have children past menopause is raising ethical questions with some experts.

17.   But the ovarian tissue of women who have cancer can contain cancer cells.

18.   But so far scientists have been unable to remove ovarian tissue and mature the eggs from start to finish in the lab, without using a surrogate body.

19.   Critser said he took the ovarian tissue from the carcasses of three freshly killed elephants he came upon during a visit to South Africa.

20.   For the first time scientists have transplanted defrosted human ovarian tissue into a mouse, extracted eggs and made them potentially fertilizable.