MFAP5, also known as MAGP2, is a component of the elastin-associated microfibrils. It belongs to the MFAP family. As a 25-kD microfibril-associated glycoprotein, MFAP5 is rich in serine and threonine residues. It stimulates the assembly of elastic fibers, a complex structure composed of a tropoelastin inner core and microfibril outer mantle comprising proteins such as fibrillins and microfibril-associated glycoproteins that guide tropoelastin deposition. MFAP5 also stabilizes type 1 procollagen and thus plays an important role in extracellular matrix homeostasis. It has multiple binding regions on fibrillins and has covalent periodic association with fibrillin-containing microfibrils.