Nuclear transfer is a form of
cloning. The steps involve removing the
DNA from an
oocyte (unfertilised egg), and injecting the
nucleus which contains the DNA to be cloned. In rare instances, the newly constructed cell will divide normally, replicating the new DNA while remaining in a
pluripotent state. If the cloned cells are placed in the uterus of a
female mammal, a cloned organism develops to term in rare instances. This is how
Dolly the Sheep and many
other species were cloned. Cows are commonly cloned to select those that have the best milk production.