Abstract
The distribution of cells reacting with antisera to cholecystokinin, substance P, gonadoliberin, methionine-enkephalin, and vasoactive intestinal peptide, demonstrated by the indirect immunoperoxidase method, was studied along the entire midgut of an insect,Aeshna cyanea. For each antiserum, the number of reacting cells increased from the middle part to the end of the midgut. Only a few cells reacted to somatoliberin, leucin-enkephalin and somatostatin antisera. In the connective sheath surrounding the midgut epithelium, nerve fibers were stained by antisera to serotonin, somatostatin, cholecystokinin, vasoactive intestinal peptide and methionine-enkephalin.
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