 | About the cover
December 2005 - Vol 23 No 12
Nature Biotechnology 23 (2005)
| | |  | Image of a mouse embryo undergoing gastrulation, in which the three embryonic germ layers —ectoderm, mesoderm and endoderm — are formed. Two papers in this issue describe the differentiation of embryonic stem cells to definitive endoderm (p 1534; p 1542). Image courtesy Olivia Kelly.
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