Negatively regulates cell proliferation and cell migration, especially in smooth muscle cells. Binds to type I collagen. Kidney. Expressed in podocytes and likely vascular endothelial cells within the glomerulus. Detected at low levels in normal embryonic kidney from embryonic day 14 through birth. Expression increases dramatically within 24 hours following birth and maximal levels coincide with the completion of morphogenesis at 2 weeks of age. N-glycosylated. Belongs to the small leucine-rich proteoglycan (SLRP) family. SLRP class V subfamily.