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The distribution of two main types of somatostatin (SOM)-positive enteric neurons (secretomotor neurons and interneurons) in the guinea pig intestine: green–SOM-positive secretomotor neurons, orange–SOM-positive interneurons, blue–other neurons, ML = muscular layer, SML = submucosal layer, M = mucosal layer, MP = myenteric plexus, SP = submucous plexus.
