Günther O, Landgraf R, Schuart J, Unger H
Exp Clin Endocrinol. 1984 May;83(3):367-9. doi: 10.1055/s-0029-1210357.
Determination of AVP in the CSF and plasma of conscious, freely moving and normally hydrated rabbits yielded in the CSF a value three times higher than in plasma, while revealing opposite rhythmic daily patterns for both compartments.