When it comes to ranking the discoveries of modern medicine, DNA is pretty high up there. There are few discoveries with wider applications than DNA, which we use for everything from identifying blood relatives to presenting evidence in court. DNA is so useful and has so many applications because it is always unique to the individual. Using DNA testing we can always pinpoint a single individual. Or can we?
Introducing chimerism: a genetic phenomenon that allows one individual to have two sets of DNA. Check out this gallery to learn all about it.