passages.id: split_4_test_2739_passage
passages.type: progene_text
passages.text: Therefore , the arrangement of promoter and operator sites in the bipolar argECBFGH ( A ) operon of M.profunda is very different from the organization of control elements in the bipolar argECBH operon of E.coli , where both promoters overlap the common operator and are equally repressible .