GTP diphosphokinase; stringent factor; guanosine 3',5'-polyphosphate synthase; GTP pyrophosphokinase; ATP-GTP 3'-diphosphotransferase; guanosine 5',3'-polyphosphate synthetase; (p)ppGpp synthetase I; (p)ppGpp synthetase II; guanosine pentaphosphate • • •