We thank Dr. Bernard Thorens (Lausanne, Switzerland) for the gift of the pGLPR-1 plasmid and Dr. Thomas G. Sherman (Pittsburgh, PA, U.S.A.) for providing the plasmids containing the AVP and OX cDNAs. This work was supported by grants from the Dirección General de Investigación Científica y Técnica and from the Fondo de Investigación Sanitaria, Spain.

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