Chondroitin sulfate-, heparin- and hyaluronan-binding protein (PubMed:11991949, PubMed:18466325, PubMed:18786170). May serve to form a basic macromolecular scaffold comprising the insoluble interphotoreceptor matrix (By similarity). Abundantly expressed in the retina (at protein level) (PubMed:11991949, PubMed:18466325, PubMed:18786170). Localizes to the photoreceptor layer of the interphotoreceptor matrix of the retina (at protein level) (PubMed:11991949). Expression is first detected in embryonic retina at 15 dpc and increases with developmental age. Highly glycosylated (N- and O-linked carbohydrates and sialic acid).