Figure 4

Expected stop codon frequencies based on expressions (4) with the approximation${\mathit{S}}_{\mathbf{2}}\approx \mathbf{ln}\left(\mathbf{3.6}{\mathit{f}}_{\mathit{G}}+\mathbf{0.4}\mathbf{\text{bf}}\right)$. Points represent average observed stop codon frequencies for TAA (blue), TGA (green) and TAG (red) across binds of 10% G-content while the approximations are shown with the lines.