title: The timing of antigenic variation in Trypanosoma vivax.
mesh_terms: D000818:Animals; D000941:Antigens; D002417:Cattle; D014644:Genetic Variation; D013997:Time Factors; D014345:Trypanosoma / Q000276:immunology*; D014370:Tsetse Flies
chemical_list: D000941:Antigens