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Donald W. Landry, Howard A. Zucker
Published in Volume 114, Issue 9
J Clin Invest. 2004; 114(9):1184–1186 doi:10.1172/JCI23065
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Figure 1

Human embryonic stem cells. The steps from fertilized egg obtained by IVF to embryonic stem cells are depicted. A few-celled embryo gives rise to the blastocyst, a structure comprised of an outer cell layer, the trophectoderm, and the ICM. The ICM is harvested and plated on feeder cells, then replated (not shown) to yield a population of embryonic stem cells.