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Proc Natl Acad Sci U S A. 1993 May 15;90(10):4582-5.

Simple and efficient production of embryonic stem cell-embryo chimeras by coculture.

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  • 1Department of Molecular Embryology, Max-Planck-Institut für Immunbiologie, Freiburg, Germany.


A method for the production of embryonic stem (ES) cell-embryo chimeras was developed that involves the simple coculture of eight-cell embryos on a lawn of ES cells. After coculture, the embryos with ES cells attached are transferred to normal embryo culture medium and allowed to develop to the blastocyst stage before reimplantation into foster mothers. Although the ES cells initially attach to the outside of the embryos, they primarily colonize the inner cell mass and its derivatives. This method results in the efficient production of chimeras with high levels of chimerism including the germ line. As embryos are handled en masse and manipulative steps are minimal, this method should greatly reduce the time and effort required to produce chimeric mice.

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