These 30 Remarkable Body Features Are Very Rare…and Fascinating

Chimerism occurs when people carry a second set of DNA in their bodies.

via GIPHY

Obviously, most people have just one set of DNA.

But not chimeras!

Chimerism tends to manifest in strange (but usually safe) ways.

via GIPHY

Sometimes, an individual may have two different blood types as a result of the two different sets of DNA.

An individual may even possess both XX and XY sex chromosomes.