title: Gut flora bearing evolutionally acquired hepatitis B virus antigen specificity?
mesh_terms: D005075:Biological Evolution; D004755:Enterobacteriaceae / Q000235:genetics*; D000939:Epitopes; D006511:Hepatitis B Antigens / Q000032:analysis*; D006801:Humans; D007422:Intestines / Q000382:microbiology*
chemical_list: D000939:Epitopes; D006511:Hepatitis B Antigens