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Major physiological and pathophysiological actions of VIP
| Short-term | Exocrine secretions |
| Hormone release | |
| Muscle relaxation (vasodilator, bronchodilator) | |
| Metabolism | |
| Long-term | Circadian rhythms |
| Growth regulator of whole fetuses and embryonic brain | |
| Other effects | Neuroprotection |
| Suppression of inflammation | |
| Immunomodulation | |
| Psychiatric disorders | |
| Effects on cell proliferation in cancer |
