Abstract
Summary
A modified tissue culture technic for rat pituitary was used for assaying the ACTH releasing activity of commercial Pitressin and purified vasopressin. Pitressin increased ACTH release whereas highly purified arginine-vasopressin had no effect. The ACTH hypophysotrope activity of commercial Pitressin is attributed to a contaminant of vasopressin of probable hypothalamic origin.
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