A simple and rapid method for isolation of retinal S antigen.

A procedure is described for the rapid isolation of S antigen from retinal tissue, by salt precipitation, gel filtration and final purification by adsorption chromatography on hydroxyapatite-agarose. The method yielded a highly purified material and allowed an excellent preservation of the antigenicity, as shown by high pathogenic activity in induction of experimental autoimmune uveoretinitis.