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| Q. |
Regarding serotonin: |
| A. | the highest concentration is in the brain |
| B. | formed by hydroxylation and decarboxylation of tyrosine |
| C. | catabolised by COMT |
| D. | some receptors are ion channels |
| E. | mediates smooth muscle relaxation |
| Answer» D. some receptors are ion channels | |
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