6UU4

E. coli sigma-S transcription initiation complex with a 3-nt RNA (\"old\" crystal soaked with GTP and dinucleotide GpA 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.