passages.id: split_4_test_1569_passage
passages.type: progene_text
passages.text: The promoter of hns , the structural gene for the abundant nucleoid - associated protein H-NS of Escherichia coli , contains , downstream of the initiation site , two four bp - long ' CG clamps ' , one of which overlaps the potential target sequence ( CCAAT ) of CspA , the cold - shock transcriptional enhancer of this gene .