Promotes matrix assembly and cell adhesiveness. Interacts with numerous extracellular matrix proteins (PubMed:18757743). Interacts with isoform 1 of MSL1 (PubMed:17335777). Interacts with isoform 3 of RASSF1 (PubMed:17335777). At 16.5 dpc, present in periosteum of ribs. At P0, present in tendons connecting the scapula and humerus to muscles (at protein level). Belongs to the small leucine-rich proteoglycan (SLRP) family. SLRP class I subfamily.