<unk>  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 animals, in which situations the goals may vary.<unk>  can be done at day two or day three, or later in the blastocyst stage, which was first performed in 1984. Factors that can affect the success of<unk>  include the Endometrial receptivity, Embryo quality and<unk>  technique.
Embryo transfer
Egg donation
Fetal surgery
Embryo cryopreservation
In vitro fertilisation
Zygote intrafallopian transfer
Cordectomy
Natural cycle in vitro fertilization