Merck, F1056-5MG, Fibronectin human plasma

Fibronectin is a class of high-molecular-weight adhesive glycoprotein, predominant in extracellular matrix (ECM) and is widely distributed in tissue and blood. The FN gene, which is highly conserved, gives rise to a minimum of 20 isoforms through alternative splicing in humans. These isoforms include notable variants such as cellular FN and plasma FN. Plasma FN is primarily synthesized in the liver, whereas cellular FN which represents only 5% of the circulating fibronectins is locally produced by various cell types.