Media gallery
Colony of undifferentiated human embryonic stems cells
Caption: Microscopic 5x view of a colony of undifferentiated human embryonic stems cells being studied in developmental biologist James Thomson's research lab at the University of Wisconsin-Madison. The embryonic stem cell colonies are the rounded, dense masses of cells. The flat, elongated cells in between the embryonic stem cell colonies are fibroblasts that are used as a "feeder layer" on which the embryonic stem cells are grown.
Date: 2001
Photo credit: University of Wisconsin-Madison
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