6UU7

E. coli sigma-S transcription initiation complex with a 6-nt RNA and an NTP (\"Old\" crystal soaked with UTP, CTP, ddGTP, and dinucleotide ApG for 30 minutes)

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.