title: Antigen-induced morphological changes in germ-free mice.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001565:Benzoates / Q000494:pharmacology*; D005856:Germ-Free Life; D006632:Histamine / Q000494:pharmacology*; D007962:Leukocytes / Q000187:drug effects*; D008198:Lymph Nodes / Q000187:drug effects*; D051379:Mice; D009929:Organ Size / Q000187:drug effects; D012965:Sodium Chloride / Q000494:pharmacology*; D013291:Streptococcus; D014947:Wounds and Injuries; D005719:gamma-Globulins / Q000494:pharmacology*
chemical_list: D001565:Benzoates; D005719:gamma-Globulins; D012965:Sodium Chloride; D006632:Histamine