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This is CBSI on the world. I'm John Batchel. Spending time with Mary Roach, the author.

Her new book, Replaceable You, Adventures in Human Anatomy. We travel to Chengdu, China,

and we meet researchers and medical personnel who are using living things, but living things that don't exist before they make them. They're called

Camara. What are they? How are they used? Where are they, Mary?

Sure. Well, in Chengdu, I was visiting researchers who were working on xenotransplantation,

which is genetically editing a pig in this case so that its heart is less reactive, so that you're knocking out a protein called the alpha-gal

protein that causes a very, very vigorous rejection from humans. So they're doing that. But in the

course of my visit and my conversation with these researchers, they mentioned work that a colleague

was doing called chimerism.

A chimera, if you're familiar with the word from mythology, it's a being that is two

parts at once, two different creatures at once. And so what, and chimerism is really just in its infancy.

I believe there is a rodent example that's been successfully created.

But what they're talking about is you're genetically editing, let's use the example of a pig again, because pigs tend to be used,

...