The assistance of Daniele Thierse in the preparation of chromaffin cell cultures and that of Dr. Sylvette Chasserot-Golaz with the confocal images was much appreciated. We acknowledge the kind gift of the anti-SNAP-23 antibody from Dr. T. Galli (CNRS UMR 144, Paris, France) and the anti-PNMT antibody from Dr. L. Denoroy (INSERM U52, Lyon, France). We thank Dr. Marie France Bader for her comments on the manuscript.

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