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The members of the chromogranin–secretogranin family of peptide hormones, biogenic amines, and neurotransmitters are enclosed within vesicles in the neuroendocrine system and a variety of neurons. These granins, the chief of which is chromogranin A, participate in sympathoadrenal activity and serve as markers of neuroendocrine tumors, especially pheochromocytoma.
Taupenot et al. (2003) studied this question.