Figure 4
Expression level of Nicotiana gene pairs. Scatter plot showing the expression level (RPKM) for the N. sylvesteris / S genome gene (x-axis) versus N. tomentosiformis / T genome gene (y-axis) for homologous gene pairs (open red circles) and homeologous N. tabacum gene pairs (closed black circles). Solid black line across diagonal represents no difference in gene expression level between species.