Molecule of the Week
May 22, 2006

This molecule was originally selected on May 5, 2003

Regarding this week’s selected substance:

Histamine is the chemical messenger that antihistamine medicines try to block. Histamine is released by mast cells during an allergy attack and can produce multiple biological effects including bronchoconstriction (asthma), vasodilation (watery eyes, runny nose), and gastric acid secretion.

Histamine

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