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The change in the radioactivity of vasopressin-neurophysin in the rat neurohypophysis after an intracisternal injection of [(35)S]cysteine was fitted to several mathematical models. The data fitted best a model in which there is a linear input of radioactive protein into one pool of the neurohypophysis, from which it is either released by an exponential process or transferred to a second pool from which it is released by a second exponential process with a rate constant much lower than the first. This model is compatible with the existence of a ;readily releasable' pool first postulated by Sachs et al. (1967). Data for the change in radioactivity of vasopressin also gave a good fit in this model. Calculation of the rate constants suggested that the first pool represented about 2% of the total hormone.

A model for the passage of the neurohypophysial hormones and their related proteins through the rat neurohypophysis