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Embryo transfer refers to a step in the process of assisted reproduction in which embryos are placed into the uterus of a female with the intent to establish a pregnancy.This technique - which is often used in connection with in vitro fertilization (IVF) - may be used in humans or in other animals, in which situations and goals may vary.
Interspecies nuclear transfer (iSCNT) is a means of somatic cell nuclear transfer being used to facilitate the rescue of endangered species, or even to restore species after their extinction. The technique is similar to SCNT cloning which typically is between domestic animals and rodents, or where there is a ready supply of oocytes and ...
In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization. The fertilized egg cell is known as the zygote. [2] [5]
Artificial embryo splitting or embryo twinning, a technique that creates monozygotic twins from a single embryo, is not considered in the same fashion as other methods of cloning. During that procedure, a donor embryo is split in two distinct embryos, that can then be transferred via embryo transfer.
Embryo transfer (ET) is a minor surgical procedure with almost no risk of injury or infection when performed properly; sheep laparoscopy allows the importation of improved genetics, even of breeds that may otherwise be non-existent in certain countries due to the regulation of live animal imports. [14]
The first IVF procedure was a wash—her doctor wasn’t able to do a transfer because none of the embryos ended up being viable after testing. The same thing happened with the second round.
Dolly was born on 5 July 1996 and had three mothers: one provided the egg, another the DNA, and a third carried the cloned embryo to term. [10] She was created using the technique of somatic cell nuclear transfer , where the cell nucleus from an adult cell is transferred into an unfertilized oocyte (developing egg cell) that has had its cell ...
But the first two times Nneka went through the procedure, it failed. "We did a transfer from frozen first and then a fresh embryo transfer second, and both times, I'd go in hoping it would work ...