title: A guanosine to adenosine transition in the 3' terminal extracistronic region of bacteriophage Q beta RNA leading to loss of infectivity.
mesh_terms: D000241:Adenosine; D001483:Base Sequence; D003090:Coliphages; D006151:Guanosine; D009154:Mutation; D012367:RNA, Viral / Q000096:biosynthesis / Q000138:chemical synthesis; D013698:Templates, Genetic
chemical_list: D012367:RNA, Viral; D006151:Guanosine; D000241:Adenosine