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KMnO4 footprints of transcription complexes at the malT promoter in the presence of limited sets of NTPs. ATP is present in lanes 3 and 9, ATP + UTP are present in lanes 4 and 10, ATP + UTP + CTP are present in lanes 5 and 11, and all four NTPs are present in lanes 6 and 12. CRP is present in lanes 7–12. A linearized plasmid is used for normalization, and the corresponding band is indicated with an asterisk.
