(E) Normalized expression levels of the native core promoters. Their activities spanned over a broad range of three orders of magnitude (promoter constructs contained block 1.11 and block 7.11 combination as nucleosomal sequences). Each color represents a different class of core promoter architecture. The middle hinge represents the median. The Interquartile range the difference between the 75th and 25th percentiles. Individual points represent values over 1.5 times the interquartile range. 3-4 biological replicate measurements. (including new cell transfection procedures and measurements of promoter activities). 