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While searching for a kidney donor, Karen Keegan stumbled upon a mystery. After undergoing genetic testing, it turned out that some of her cells had a completely different set of genes from the others. And this second set of genes belonged to her twin sister— who had never been born. How did this happen? Chimerism expert, Kayla Mandel Sheets, explores the condition in this video short.

Lesson by Kayla Mandel Sheets, directed by Luísa M H Copetti, Hype CG.