<unk>  is a phenomenon in prenatal development, i.e. early in pregnancy. It is the event where the embryo, at this stage a blastocyst, adheres to the wall of uterus. It is by this adhesion the fetus receives the oxygen and the nutrients from the mother to be able to grow.
Implantation
Autotransplantation
Allotransplantation
Skin grafting
Foreskin restoration
Castration
Split thickness skin graft
Organ donation