expression as a function of occurrences of the word GGCTAAG The average expression of genes presenting n occurrences of the word GGC-TAAG as a function of n in the 14 min. time point of the α-synchronized cell-cycle experiment of Spellmann et al., Ref. . In parentheses is the number of genes with n occurrences of GGCTAAG in the upstream region. The horizontal line represents the average expression for the whole genome.