| Description | Letter from Sydney Udenfriend of the National Heart Institute to Gaddum, enclosing reprints and noting that the hypothalamus is capable of initiating norepinephrine synthesis from tyrosine in the diet. Reprints include articles on physiologically active amines in fruits and vegetables (2b), localisation of dopamine-B-Oxidase in the brain (2c), inhibitors of norepinephrine metabolism (2d), and metabolism of norepinephrine in patients with pheochromocytoma [adrenal gland tumours] (2e). |