title: The effect of tsetse passage on variants of Trypanosoma vivax.
mesh_terms: D000818:Animals; D000941:Antigens; D002417:Cattle; D014644:Genetic Variation; D012756:Sheep; D014345:Trypanosoma / Q000276:immunology*; D014354:Trypanosomiasis, Bovine / Q000382:microbiology; D014370:Tsetse Flies
chemical_list: D000941:Antigens