Abstract
Human adrenal medulla and medullary tumors were explanted in vitro immediately after their operative removal. The media from adrenal medulla cultures never contained detectable amounts of nor-adrenaline (NA). The media from tumor cultures contained large amounts of NA on the first and smaller amounts on following 3 days. Catecholamines were found in fluids from both tumor and medulla cultures for at least 40 days.

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