21.   Some of the concern focuses on payments and the medical risks involved to the donor eggs.

22.   The charges stunned other fertility experts, he said, because those alleged to have improperly used donor eggs in patients were highly respected leaders in the field.

23.   The development would also greatly lower the cost of donor eggs for infertile women.

24.   The reason, according to these programs, is that while there is a limited supply of donor eggs, there is no shortage of donor sperm.

25.   The use of donor eggs by infertile couples remains relatively uncommon.

26.   Demand is high for donor eggs, and some wait up to a year to receive them.

27.   In cloning, the DNA of an adult animal is inserted into a donor egg emptied of its own DNA.

28.   Scientists would create a clone of a sick patient by removing the nucleus of a donor egg and replacing it with that of a cell from the patient.

29.   The subject comes up in the family, and the children know, for example, that women who get pregnant with donor eggs often have multiple births.

30.   The British ministry of health issued a warning Wednesday about an ad taken out in the local press by an American fertility clinic offering donor eggs to clients worldwide.