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Representative photomicrographs of c-Fos immunoreactivity induced by intraperitoneal corticotropin-releasing factor (CRF) in the submucosal plexus of duodenum, jejunum, terminal ileum, and proximal and distal colon of rats. CRF (10 µg/kg) was injected intraperitoneally, and rats were euthanized 1 h later for c-Fos immunohistochemistry. Scale bar = 50 μm
