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<span lang="EN-US" style="FONT-SIZE: 11pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 바탕; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: KO; mso-bidi-language: AR-SA">Bacterial RNA polymerase employs a promoter-recognizing subunit, sigma factor to initiate transcription (Travers and Burgess, 1969).<span style="COLOR: red"> </span></span>