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fibronectin fi·bro·nec·tin (fī'brə-něk'tĭn)
A fibrous linking protein that functions as a reticuloendothelial mediated host defense mechanism and is impaired by surgery, burns, infection, neoplasia, and disorders of the immune system.
Any of several glycoproteins that occur especially in plasma and in soft connective tissue. Fibronectins are important for the adhesion of fibrous extracellular tissue matrices and also play roles in cellular adhesion, embryonic cellular differentiation, phagocytosis, and the aggregation of platelets in blood clotting.