title: New areas arising from studies of secretory immunity.
mesh_terms: D000653:Amniotic Fluid / Q000276:immunology*; D000818:Animals; D006801:Humans; D007070:Immunoglobulin A / Q000378:metabolism; D007165:Immunosuppression Therapy; D051379:Mice; D010447:Peptide Hydrolases / Q000378:metabolism; D013298:Streptococcus sanguis / Q000201:enzymology; D000509:alpha-Fetoproteins / Q000276:immunology*
chemical_list: D007070:Immunoglobulin A; D000509:alpha-Fetoproteins; D010447:Peptide Hydrolases