4Z0U:
reference: Interaction with Single-stranded DNA-binding Protein Stimulates Escherichia coli Ribonuclease HI Enzymatic Activity., Petzold C, Marceau AH, Miller KH, Marqusee S, Keck JL, J Biol Chem. 2015 Jun 5;290(23):14626-36. doi: 10.1074/jbc.M115.655134. Epub 2015, Apr 22. PMID: 25903123

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