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This image depicts a colony of human embryonic stem cells grown over a period of 10 months in the absence of mouse feeder cells. The cell nuclei are stained green; the cell surface appears in red.
Photo date: 2004
Image credit: courtesy Ren-He Xu

Ren-He Xu, developmental biologist in the WiCell Research Institute.
Photo date: August 2001
Image credit: Steve Milanowski/courtesy Wisconsin Alumni Research Foundation
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