Occurrence in chick embryo vitreos humor of a type IX collagen proteoglycan with an extraordinariliy large chondroitin sulfate chain and short alpha 1 polypeptide. - Yada,T.; Suzuki,S.; Kobayashi,M.; Hoshino,T.; Horie,K.; Kimata,K. (J Biol Chem, 1990)