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Muscarinic receptors distribution (after Yamanishi et al 2001)
| Muscarinic receptor | Distribution |
|---|---|
| M1 | Brain (cortex, hippocampus), glands, sympathetic ganglia |
| M2 | Heart, hindbrain, smooth muscle |
| M3 | Smooth muscle, glands, brain |
| M4 | Brain (forebrain, striatum) |
| M5 | Brain (substantia nigra), eye |
