Our results show that genetic background is probably an important factor in cloning efficiency and establish that our F1 ES cells are efficient donor cells for generating cloned mice. We have also ...

Figure 1: Nucleus donor cells and a clone. We found that 50-58% of the activated oocytes developed to morulae or blastocysts in vitro, but only 3 of 274 transferred embryos (1%) reached full term ...

The DNA in that tissue was of great quality, and allowed the team to clone three new members of the species. The fact that they came from older tissue means that it has the genetic diversity from ...