I read some of this (its way beyond me). http://www.cell.com/cell/abstract/S0092-8674(16)31752-4 I was directed to the link from IFLS (google it if you don't know what it is and are curious) so I don't know if its legitimate / peer reviewed stuff or not, but it does read like real research in that for me, it might as well be written in a non-English language. Basically discusses the creation of a human / swine chimera embyro that developed for a little while. The goal is organ creation. Is it known that such a chimera cannot be viable and develop into an individual, or is is possible that a chimera might be viable, and assessing that is part of the learning curve? I am not intending a discussion on ethics, I am curious as to the answer.