Figure 7From: Transcriptome analysis of the filamentous fungus Aspergillus nidulans directed to the global identification of promotersDinucleotide composition around transcription start sites. The proportions of all possible dinucleotides from 100 bp upstream to 25 bp downstream of 4637 putative ‘tight’ transcription start sites (100-200 bp upstream shows no perturbation from the 6.5% expected by chance and is not shown). A small peak in AA, AT and TA frequencies in the region -45 to -30 may represent the TATA box. From -50 to +25 around the transcription start site is enriched for pyrimidine pairs (TT, TC, CT, CC) and the TSS and position -1 is strongly enriched for CA, reflecting the single nucleotide frequencies at these positions.Back to article page