Enables collagen V binding activity and heparin binding activity. Acts upstream of or within extracellular matrix organization and positive regulation of cell-substrate adhesion. Located in interstitial matrix. Is expressed in several structures, including heart valve; medulla oblongata part of 4th ventricle choroid plexus; sensory organ; tendon; and ventricular layer. Orthologous to human ECM2 (extracellular matrix protein 2). [provided by Alliance of Genome Resources, Apr 2022]