( A ) Average 3′/5′ ratios of the run-on signals obtained from a wild-type BY4741 strain for the transcriptional units present in the 377 genes array. RP genes are represented in red and RiBi genes in green. Error bars represent standard deviation. The box-and-whiskers diagrams represent the minimum, the maximum, the average (cross), the median and the 25th and the 75th percentiles of the average 3′/5′ run-on ratios for the indicated gene categories. The P -values of the Student’s two-tailed t -test for those samples with unequal variances are shown. ( B ) The same as in A but for the ChIP signals obtained with the 8WG16 antibody. ( C ) Scatter plot of the average 3′/5′ run-on ratios in A ( X -axis) versus the average 3′/5′ ChIP ratios in B ( Y -axis). Linear regressions and their corresponding Pearson’s correlation coefficients (R) are shown.