Promot -35 region Spacer -10 region Spacer Transcribed-- trp operon GTTGACAN, TTA A C N7 tRNA Tyr CT TTAC AT G A N7 GT TGAC A N,GATACT lac operon TT A C N17 A GT CTTGAT小N。「 TATAAT [ TTCCA小N,[ TATACTI T7A3 TT G A N TACGAT CONSENSUS TT A C ATAAT Pribnow box 注意原核启动子在35和-10区域的保守序列注意原核启动子在-35 和-10区域的保守序列 Pribnow box