- Identification of two distinct mutations at the same nucleotide position, concomitantly with a novel polymorphism in the vasopressin-neurophysin II gene (AVP-NP II) in two dutch families with familial neurohypophyseal diabetes insipidus. Abbes, A.P., Bruggeman, B., van Den Akker, E.L., de Groot, M.R., Franken, A.A., Drexhage, V.R., Engel, H. Clin. Chem. (2000)