title: Removal of blood substance "A" from pepsin by gel filtration.
mesh_terms: D000017:ABO Blood-Group System / Q000302:isolation & purification*; D002364:Caseins; D002850:Chromatography, Gel; D006385:Hemagglutination Inhibition Tests; D008722:Methods; D008970:Molecular Weight; D010434:Pepsin A / Q000032:analysis*; D013053:Spectrophotometry
chemical_list: D000017:ABO Blood-Group System; D002364:Caseins; D010434:Pepsin A