Explosive exclamation

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it’s A 21 letters crossword definition.
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Possible Answers:

ACHOO.

Last seen on: –Newsday.com Crossword – Feb 14 2020
Newsday.com Crossword – Feb 14 2020

Random information on the term “ACHOO”:

Histamine is an organic nitrogenous compound involved in local immune responses, as well as regulating physiological function in the gut and acting as a neurotransmitter for the brain, spinal cord, and uterus. Histamine is involved in the inflammatory response and has a central role as a mediator of itching. As part of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues. Histamine increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues. It consists of an imidazole ring attached to an ethylamine chain; under physiological conditions, the amino group of the side-chain is protonated.

Histamine base, obtained as a mineral oil mull, melts at 83–84 °C. Hydrochloride and phosphorus salts form white hygroscopic crystals and are easily dissolved in water or ethanol, but not in ether. In aqueous solution, the imidazole ring of histamine exists in two tautomeric forms, identified by which of the two nitrogen atoms is protonated. The nitrogen farther away from the side chain is the ‘tele’ nitrogen and is denoted by a lowercase tau sign and the nitrogen closer to the side chain is the ‘pros’ nitrogen and is denoted by the pi sign. The tele tautomer, Nτ-H-histamine, is preferred in solution as compared to the pros tautomer, Nπ-H-histamine.

ACHOO on Wikipedia