part of adrenal medulla chromaffin cell A type of amine precursor uptake and decarboxylation cells that stain readily with chromium salts, their cytoplasmic granules taking on a characteristic brown color; they are found especially in cells of the adrenal medulla and in paraganglia of the coccygeal gland and carotid gland, along the sympathetic nerves, and in various organs. They contain chromaffin granules. BTO:0000259 BrendaTissueOBO pheochrome cell pheochromocytes neuroendocrine cell