As a GMO myself...

I've started calling myself a GMO in some conversations where it's useful the reason being is that the placental mammal syncytin gene is not ancestral to the line but evolved as a part of a virus and was inserted by a virus. Just like in some GMOs. http://blogs.discovermagazine.com/loom/2012/02/14/mammals-made-by-viruses/#.Vso5mvkrJhE