Major connective tissue mitoattractant secreted by vascular endothelial cells. Promotes proliferation and differentiation of chondrocytes (By similarity). Mediates heparin- and divalent cation-dependent cell adhesion in many cell types including fibroblasts, myofibroblasts, endothelial and epithelial cells (By similarity). Enhances fibroblast growth factor-induced DNA synthesis (By similarity). Monomer (By similarity). Interacts with TSKU (PubMed:30232710). Testis, spleen, kidney, lung, heart, and brain (lowest level in testis and highest in lung). By growth factors. Belongs to the CCN family.