1.   At about the same time, biologists also discovered how to transfer mouse embryos from one female to another to establish a pregnancy in the surrogate mouse mother.

2.   By transferring multiple embryos, doctors risk creating pregnancies of triplets, quadruplets and more.

3.   By waiting about a week before transferring embryos to women, doctors can increase the chances that those they implant will survive.

4.   Efforts to reduce these rates by transferring fewer embryos can lead to a lower pregnancy rate, making patients and clinic directors alike unhappy.

5.   He inserted them into pig embryos and transferred the embryos into surrogate mothers, who gave birth to the four cloned piglets.

6.   Its advocates say the guideline could help curb the number of IVF supertwins, yet allow doctors to transfer more embryos in difficult cases.

7.   She suspects that the clinics advertising money-back guarantees if no baby results are transferring as many as six or more embryos.

8.   Since only two embryos are transferred into each woman, there are no triplet pregnancies, though so far eight of the pregnancies have been determined to be twins.

9.   The embryos are transferred back into the woman in the hope that they will attach to her uterus, resulting in pregnancy.

10.   The embryo was then transferred into a third sheep, which acted as surrogate mother.