Attenuation of the polypeptide 7B2, prohormone convertase PC2, and vaso-pressin in the hypothalamus of some Prader-Willi patients: Indications for a processing defect. - Gabreels, BATE; Swaab, DF; deKleijn, DPV (J Clin Endocrinol Metab, 1998)