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Ivan M Suzman wrote: > Epinephrine is produced from norepinephrine, which in turn is > produced from dopamine. If the dopamine supply is abnormal, do you > think this could in turn change the autonomic nervous signalling to > the sino-atrial node of the heart? Ivan, I believe that the production of epinephine you refer to occurs in the adrenal glands, which also produce dopamine. The abnormal dopamine supply (PD) is in the subtatia nigra. Phil