Sequence motifs found within the promoter regions of RPS4Y1 and RPS4Y2. The numbers indicate nucleotide positions relative to the TSS, according to . For RPS4Y2, we considered that the TSS overlaps the ATG. Hyphens represent inserted/deleted nucleotides. The olygopyrimidine tract overlapping the RPS4Y1 transcription start site is underlined. Arrows indicate the orientation of the predicted transcription factor binding sites (forward or reverse strand). The positions within the sequence motifs that differ between the two genes are in italic.