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TATA boxes and poly(A) signals (A) Genomic surrounding of TSSs with TATA box within a ±5 bp interval. The first letter of TSSs (position 0) is enriched with G/A bases, while the − 1 position contains mainly C/T bases. (B) A) Genomic surrounding of TSSs without TATA box within a ±5 bp interval. The 0 and + 1 TSS positions are enriched with G letters (C) Sequence motifs of transcripts containing polyadenylation signals. (D) Sequence motifs of transcripts without polyadenylation signals.
