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Distribution of muscarinic receptors
| Subtypes | Distribution |
|---|---|
| M1 | Brain (cortex, hippocampus), sympathetic ganglia, glands |
| M2 | Heart, smooth muscle, hindbrain |
| M3 | Smooth muscle, glands, brain |
| M4 | Brain (forebrain, striatum) |
| M5 | Brain (substantia nigra), eye |
