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Gaps between groups of RNA polymerase molecules are randomly distributed along the operon and are not correlated with any specific site. The y axis shows the total number of polymerases observed at 110-bp intervals along the rrn operons, assuming an average rrn operon length of 5.5 kb. (A) Strain containing pBR322 (n = 19 chromosomal operons); (B) strain containing pNO1301 (n = 30).
