Fig. 2
From: Convergent degeneration of olfactory receptor gene repertoires in marine mammals
Comparison of the gene number and sequence similarity in each OGG. a and b Distribution of the number of intact OR genes and pseudogenes among OGGs. c Distribution of average amino acid similarity among genes in each OGG. d Number of intact OR genes in different OGGs was positively correlated with the number of pseudogenes in the corresponding OGGs (r = 0.886, p value < 2.2 × 10− 16). e Difference in the mean number of OR genes per OGG among different species was positively correlated with the average OGG size (r = 0.860, p value < 2.2 × 10− 16). f Distribution of the OGG number among different species (upper panel); and gene numbers of the 20 largest OGGs (lower panel)