Abstract
Extracts of rat brain and gastrointestinal tract, analyzed by reverse-phase high-performance liquid chromatography and radioimmunoassay, contained two bombesin-like immunoreactivity peaks with similar retention times as porcine gastrin-releasing peptide (GRP) and its COOH-terminal decapeptide, neuromedin C or GRP(18-27). However, the GRP-like peptide peak did not elute with exactly the same retention time as porcine GRP. The highest concentration of bombesin-like immunoreactivity was found in extracts of antrum, whereas the lowest was found in whole brain. Neuromedin C was present at lower concentrations than the GRP in antrum, duodenum, and ileum, while similar amounts of each were found in brain.
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