Enables collagen binding activity; heparin binding activity; and identical protein binding activity. Involved in liver regeneration and protein polymerization. Located in several cellular components, including Golgi lumen; basement membrane; and rough endoplasmic reticulum lumen. Used to study proteinuria. Biomarker of diabetic retinopathy and visual epilepsy. Human ortholog(s) of this gene implicated in Churg-Strauss syndrome; granulomatosis with polyangiitis; and thrombosis. Orthologous to human VTN (vitronectin). [provided by Alliance of Genome Resources, Apr 2022]