11.   The sperm and the egg are combined in a laboratory to cause fertilization and the embryo is transferred back into the uterus to develop naturally.

12.   There is ZIFT, for zygote intrafallopian transfer, in which fertilized embryos are transferred to the tubes.

13.   Theoretically, you could transfer more embryos.

14.   West and Cibelli said they had no intention of transferring the embryos to a uterus, a step they consider unethical and unsafe for it.

15.   At her clinic, she said, when six-cell embryos are transferred into women, only about one out of five will become a baby.

16.   In particular, she explained, techniques for implanting embryos have been refined to the point where fewer embryos are transferred and thus multiple births are less likely.

17.   Under special circumstances, clinics will be allowed to transfer three embryos if necessary.