Enables collagen binding activity and heparin binding activity. Acts upstream of or within several processes, including collagen fibril organization; regulation of JUN kinase activity; and triglyceride metabolic process. Located in extracellular matrix and extracellular space. Is expressed in several structures, including alimentary system; cardiovascular system; endocrine gland; genitourinary system; and immune system. Human ortholog(s) of this gene implicated in Ehlers-Danlos syndrome; Ehlers-Danlos syndrome classic-like 1; and vesicoureteral reflux. Orthologous to human TNXB (tenascin XB). [provided by Alliance of Genome Resources, Apr 2022]