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