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Review Question - QID 212709

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QID 212709 (Type "212709" in App Search)
A 41-year-old man presents to urgent care with a 1-week history of severe diarrhea. He says that he has been having watery stools every 2-3 hours. The stools do not contain blood and do not float. On presentation, he is observed to have significant facial flushing, and laboratory tests reveal the following:

Serum:
Na+: 137 mEq/L
K+: 2.7 mEq/L
Cl-: 113 mEq/L
HCO3-: 14 mEq/L

A computed tomography scan reveals a small intra-abdominal mass. Staining of this mass would most likely reveal production of which of the following?