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"In her blood, she was one person, but in other tissues, she had evidence of being a fusion of two individuals," Uhl said.

It's a rare condition called chimerism, with only 30 documented cases worldwide. In Greek mythology, "chimera" means a monster: part goat, part lion, part snake.

In human biology, a chimera is an organism with at least two genetically distinct types of cells — or, in other words, someone meant to be a twin. But while in the mother's womb, two fertilized eggs fuse, becoming one fetus that carries two distinct genetic codes — two separate strands of DNA.

The twin is invisible, but for chimeras the twin lives microscopically inside the body as DNA.

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Originally posted by WashsYoungerSexierBrother:
Thats cool!!! I saw it on CSI.

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