Adenosine Triphosphate, Aspartate Carbamoyltransferase, Bacterial Proteins, Base Sequence, Cytidine Triphosphate, DNA, Bacterial, Escherichia coli, Escherichia coli Proteins, Genes, Bacterial, Guanosine Triphosphate, Molecular Sequence Data, Operon, Peptide Elongation Factors, Pyrimidines, RNA, Bacterial, Regulatory Sequences, Nucleic Acid, Transcription Factors, Transcription, Genetic, Transcriptional Elongation Factors, Uridine Triphosphate