Fibronectin, a high-molecular-weight glycoprotein occurring in plasma and on the surface of many cells, is involved in cell adhesion and other cell-surface phenomena. Vitamin A deficiency in rats resulted in a threefold increase in the concentration of fibronectin in serum, as measured immunochemically. In vitamin A-depleted human subjects, on the other hand, no correlation could be found between plasma retinol and fibronectin levels.
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