passages.id: split_5_test_3586_passage
passages.type: progene_text
passages.text: The complete sigB operon is preceded by a sigma A - like promoter ( PA ) and has the order PA-orfR - orfS - orfT - orfU - PB - rsbV - rsbW - sig B - rsbX , where rsb stands for regulator of sigma-B and the previously identified sigma B - dependent promoter ( PB ) is an internal promoter preceding the downstream four - gene cluster .