Selective Decrease in Immunoreactive Somatostatin in Rat Intermediate Pituitary Lobe after Stalk Section

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Abstract
Immunoreactive somatostatin is present in the intermediate pituitary lobe of the rat and, to a lesser extent, in the posterior lobe. Section of the pituitary stalk results in a marked (80%) decrease in somatostatin in the intermediate pituitary lobe, but no change in the peptide levels in the posterior lobe. These results indicate that a substantial part of intermediate lobe somatostatin is located in nerve fibers originated in the brain.

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