Immunohistochemical localization in rabbit brain of a peptide resembling the COOH-terminal octapeptide of cholecystokinin.

Immunohistochemical techniques were used to demonstrate the presence of a material resembling the COOH-terminal octapeptide of cholecystokinin in rabbit cerebral cortical neurons. Deep staining was seen in cell bodies throughout the cortical grey matter and diffusely in the subcortical white matter.