title: Studies on the antigenic structure of Treponema pallidum. 1. Nichols'virulent strain, preliminary experiments.
mesh_terms: D000941:Antigens; D013180:Sprains and Strains; D014210:Treponema pallidum / Q000276:immunology*
chemical_list: D000941:Antigens
keywords: ANTIGENS; TREPONEMA PALLIDUM/immunology