| ENS | enteric nervous system |
| NO | nitric oxide |
| GI | gastrointestinal |
| MP | myenteric plexus |
| OSP | outer submucous plexus |
| nNOS | neuronal isoform of nitric oxide synthase |
| PGP 9.5 | protein gene product 9.5 |
| IR | immunoreactive |
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