6EQY:
reference: Structure and nucleic acid binding properties of KOW domains 4 and 6-7 of human transcription elongation factor DSIF., Zuber PK, Hahn L, Reinl A, Schweimer K, Knauer SH, Gottesman ME, Rosch P, Wohrl BM, Sci Rep. 2018 Aug 3;8(1):11660. doi: 10.1038/s41598-018-30042-3. PMID: 30076330

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