Figure 4
From: Non-uniqueness of factors constraint on the codon usage in Bombyx mori
The ENc plotted against GC3s. ENc denotes the effective number of codons, and GC3s denotes the GC content on the third synonymous codon position. Black boxes, and blue triangles indicate ribosome genes and total genes, respectively. The red solid line represents the expected curve of positions of genes when the codon usage was only determined by the GC3s composition.