We gratefully acknowledge the generosity of Dr. F. Miragall (Institut für Anatomie, Universität Regensburg, Regensburg, Germany) for the antibodies to PSA-NCAM and NCAM. We also thank M. March for her excellent technical assistance. This study was supported by CICYT grant SAF 96-0185-CO2-02, DGESIC grant PM 97-0075-CO2, Generalitat Valenciana grant GV-D-VS-20-126-96, and Fundacion R. Areces.

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