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MFAP5, also known as Microfibrillar-associated protein 5, is a 173 amino acid protein that is 20 kDa, extracellular matrix secreted, and it is a component of the elastin-associated microfibrils. Current research is being performed on this protein involvement in marfan syndrome, scleroderma and skin fibrosis. The protein is involved in molecules associated with elastic fibres, extracellular matrix organization, elastic fibre formation, tropoelastin associates with microfibrils, elastin cross-linking by lysyl oxidase, and notch signaling pathways where it interacts with FBN2, JAG1, JAG2, MEGF6, VWF, FBLN1, FBN1, GYG1, DLL1, MFAP2, NOTCH1, ENAM, FBN3, and DLL4 proteins.