Pol Ill promoter may be 20.5 RNA polymerase Ill downstrean of the startpoint uses both downstream and upstream promoters Startpoint Promoter Upstream Transcribed region 入AA Figure 20. 5 Deletion analysis shows that the RNA promoter for SS RNA Deletion that removes sequences upstream of genes Is internal promoter allows transcnption to init ate from Initiation occurs a position corresponding to usual startpoint fixed distance( upstream of the promoter. 消当 RNAFigure 20.5 Deletion analysis shows that the promoter for 5S RNA genes is internal; initiation occurs a fixed distance (~55 bp) upstream of the promoter. 20.5 RNA polymerase III uses both downstream and upstream promoters