FIG. 3.

Determination of interpolymerase distance. The distance from polymerase center to polymerase center of all adjacent polymerases was measured. A. Interpolymerase spacing in the wild-type strain (n = 217 for 16S and n = 356 for 23S from 11 operons). B. Interpolymerase spacing in the nusB::IS10 mutant strain (n = 459 for 16S and n = 444 for 23S from 27 operons). Closed columns indicate polymerase molecules on the 16S genetic region, and open columns represent polymerase molecules on the 23S genetic region.