content: Fun fact : everyone who accepts a transplant has chimeric  DNA. For example say a girl (genetically XX) named Sally takes the kidney of her male cousin  (genetically XY) named Joey. If that kidney takes, Sally doesn't just have Joey's kidney, she has Joey's DNA in random cells throughout her entire body. Meaning that some of her hair, her skin, her bones, whatever would be XY and have Joey's DNA instead of Sally's XX DNA  Obviously simplified example, but it gets the point across. Pretty neat.