Figure 3

Distribution of relative numbers of samples in which duplicated gene pairs expressed. (a) block, (b) dispersed, and (c) tandem pairs. Each cell corresponds to a range of relative number of samples. The top-right cell represents the relative number of both members in the range of (0.8, 1.0]; the bottom-right cell represents the relative number of gene 1 in the range (0.8, 1.0] and that of gene 2 in the range of (0.0, 0.2]. Cells near the centre represent the relative number of both members close to 0.5. Gray scales indicate the number of duplicated pairs within the corresponding squares. Here we also set the expression number of gene 1 less than that of gene 2 for each duplicated pair. By the definition of relative expression number, the sum of relative expression numbers of two members should greater than or equal to one.