Fig. 3.

Intergenes and ars elements have similar sequence characteristics. (A) Dinucleotide frequencies of intergenes (blue) and ars elements (red). (B) Observed vs. expected frequencies of dinucleotides with A in the first position. The frequencies of the nucleotides A (green), G (black), C (blue), and T (red) after an A residue was determined for S. pombe intergenes (Left) and known ars elements (Right). The frequencies expected for random sequences of the same composition were calculated. The differences between the expected and observed frequencies were normalized to the expected frequencies.