Evidence of immunochemical differences between free and bound secretory piece.
D000818:Animals; D000937:Antigen-Antibody Reactions; D000941:Antigens; D003126:Colostrum / Q000276:immunology*; D005260:Female; D006241:Haptens; D006801:Humans; D007106:Immune Sera; D007120:Immunochemistry; D008895:Milk, Human / Q000276:immunology*; D008967:Molecular Biology; D008970:Molecular Weight; D010455:Peptides; D011817:Rabbits; D005719:gamma-Globulins / Q000032:analysis*
D000941:Antigens; D006241:Haptens; D007106:Immune Sera; D010455:Peptides; D005719:gamma-Globulins