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Acknowledgements

We thank Drs. Richard H. Scheller (Stanford) and William Trimble (Toronto) for plasmids encoding synaptobrevin and syntaxin, respectively. Clones for mSNAP-23 and hSNAP-23 were kindly provided by Drs. Giulia Baldini (New York) and Thierry Galli (Paris), respectively. This study was supported by the Deutsche Forschungsgemeinschaft (IIB2-Bi 660/1-1) and Fonds der Chemischen Industrie. V.V.V. and K.Y. were supported by fellowships from the Alexander von Humboldt Foundation.

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