May be involved in collagen fiber assembly. Homodimer. Forms a ternary complex with MFAP2 and ELN (By similarity). Found in several connective tissues, especially in articular cartilages. The two attached glycosaminoglycan chains can be either chondroitin sulfate or dermatan sulfate. Belongs to the small leucine-rich proteoglycan (SLRP) family. SLRP class I subfamily.