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Yes, fibrinogen is playable

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Found in the following dictionaries

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SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Fibrinogen" Definition

noun

A protein in the blood plasma that is essential for the coagulation of blood and is converted to fibrin by the action of thrombin in the presence of ionized calcium.
A plasma protein that is produced in the liver and is converted into during blood clot formation.
A soluble protein present in blood plasma, from which fibrin is produced by the action of the enzyme thrombin.

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