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They're released by the immune system
Answer for the clue "They're released by the immune system ", 10 letters:
histamines
Word definitions for histamines in dictionaries
Wiktionary
Word definitions in Wiktionary
n. (plural of histamine English)
Usage examples of histamines.
A swarm of histamines rushed forth to combat the dust mites storming into Bubba's sinuses and lungs as he probed with a flashlight on the floor of his Jeep.