title: Wide occurrence of guanosine 5'-tetraphosphate in commercial preparations of GTP.
mesh_terms: D006150:Guanine Nucleotides / Q000032:analysis*; D006160:Guanosine Triphosphate / Q000032:analysis* / Q000592:standards; D010727:Phosphoric Diester Hydrolases
chemical_list: D006150:Guanine Nucleotides; D006160:Guanosine Triphosphate; D010727:Phosphoric Diester Hydrolases