Sorry, I didn't clarify too well, was quite a while ago I read the article. The mice were bred in a sterile environment, so no bactreia or microbes could grow from inception. The mice were born deformed. I thought dna was solely responsible for how the body is formed but it seems not. I don't see how they could be part of our dna even though bacteria/microbes play a big part of our overall makeup. So they must be working for the dna or possibly in unison with each other.

BTW Maxmagician does not endorse cruelty to animals of any kind.