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WEKU
WEKU
Rob Stein

Japanese scientists race to create human eggs and sperm in the lab

Katsuhiko Hayashi, a developmental geneticist at Osaka University, is working on ways to make what he calls "artificial" eggs and sperm from any cell in the human body. (Kosuke Okahara for NPR)

Katsuhiko Hayashi pulls a clear plastic dish from an incubator and slides it under a microscope.

"You really want to see the actual cells, right?" Hayashi asks as he motions toward the microscope.

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