Scientists Cassiano Carromeu, above, and Wonjong Si, left, prepare cells at StemoniX Inc.

Scientists Cassiano Carromeu, above, and Wonjong Si, left, prepare cells at StemoniX Inc. Photo by Jamie Scott Lytle.

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Ping Yeh

— Ping Yeh was 36 years old when his doctors recommended maximum-potency chemotherapy — a treatment so strong that he may not survive it...

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