Assertion: autonomic nervous system's neuron | /r/CapableOf | synthesize only norepinephrine
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text: Because of their proximity to the adrenal cortex which surrounds the medulla and secretes hydrocortisone (or cortisol), the neurons of the medulla are able to synthesize not only norepinephrine but also, by attaching a methyl group to this compound, epinephrine (or adrenaline).