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Supported in part by the Volkswagen-Stiftung (R.S., P.H.S., B.S.), the Deutsche Forschungsgemeinschaft (P.H.S.), and Bristol-Myers Squibb (P.H.S.). We thank H. Cu for the plasmid pMC-Cre, A. Nagy for the R1 ES cell line, R. Morrison and J. R. Wenthold for providing antibodies, and M. Lang, A. Herold, S. Nestel, and B. Joch for technical assistance. D.Z. was the recipient of a postdoctoral fellowship from the Human Frontier Science Program.
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