(B) Heatmap depicting the relative expression level measurements of promoter constructs with different free combinations of block 1 and block 7 compared to B1.11 + B7.11 expressions (marked with a red rectangle). Results were pooled for all tested native core promoters to calculate the average deviation to B1.11 + B7.11 expressions. Bar plots on the top and the left represent the GC content of each block 1 and block 7 sequence. Block 7 with column "w/o B7" represents the results obtained from promoters without block 7 sequence. 