Figure 4
From: GC-compositional strand bias around transcription start sites in plants and fungi
Correlation between the two nucleotide frequencies in plants. The figure illustrates the correlation coefficients (r) between the two nucleotide frequencies (A-T, A-G, A-C, G-C, T-C and T-G) at each position around the TSS in (a) Arabidopsis and (b) rice genes. Each nucleotide frequency at a particular position was defined as the frequency of the nucleotide in a 100-bp window at that position. Correlation coefficients were calculated using these frequencies (see Methods section). The numbers of sequences analyzed were 7,708 for Arabidopsis and 14,868 for rice.