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Biosynthetic pathways in pheochromocytomas/paragangliomas and carcinoids; c1: tryptophan hydroxylase; c2: hydroxytryptophan decarboxylase; p1: tyrosine hydroxylase; p2: DOPA decarboxylase; p3: dopamine-beta-hydroxylase; p4: phenylethanolamine-N-methyltransferase
