Sialoprotein associated with cones and rods is a glyco- protein in humans, monkeys, and chickens and a proteo- glycan in mice, rats, and cows, whereas SPACRCAN is a proteoglycan with chondroitin sulfate glycosaminoglycan side chains

*Department of Ophthalmology, Aichi Medical University, Nagakute, Aichi, Japan Department of Ophthalmology, The Second Hospital of Jilin University, Changchun, China The Aichi Prefectural College of Nursing and Health, Nagoya, Aichi, Japan §Department of Pathology, Aichi Medical University, Nagakute, Aichi, Japan ¶Department of Dermatology, National Center for Geriatrics and Gerontology, Aichi, Japan **The Institute for Molecular Science of Medicine, Aichi Medical University, Nagakute, Aichi, Japan