A 60-year-old woman presents with an 8-month history of colicky abdominal pain, diarrhea, and occasional flushing of the face and chest. Examination reveals bilateral wheezing and a distended, nontender abdomen. Levels of 5-hydroxyindoleacetic acid (5-HIAA) are elevated, and a computed tomography scan demonstrates a hypervascular plaque-like mass in the terminal ileum with soft-tissue spokes radiating into the mesenteric fat.
Which of the following neurotransmitters may be causing this patient’s symptoms?
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