Fig 1.
The human functional OR genes evolved relatively faster than the genome average.
Comparison of Ka (A), Ks (B) and Ka/Ks (C) between human functional OR genes and the rest of the genes in the human genome”.
Fig 2.
The human functional OR genes tend to have a higher Tajima’s D than the genome average.
Comparisons of Tajima’s D between functional OR genes and all genes in the human genome. (A) In AFR. (B) In EUR.
Fig 3.
Different evolutionary rates and selection patterns among families of human functional OR genes.
(A) Comparison of Ka. (B) Comparisons of Ka/Ks. (C) Comparisons of Tajima’s D in AFR. (D) Comparison of Tajima’s D in EUR.
Fig 4.
Evolutionary relationships between human and outgroup species.
A dendrogram illustrating the evolutionary relationships of functional OR genes between the indicated species.
Fig 5.
Families of human functional OR genes significantly differ in the number of syntenic genes in the outgroup species.
Comparison of numbers of syntenic genes in outgroups species among families of human functional OR genes. The comparison was statistically significant (P = 1.42×10−30) based on Kruskal–Wallis test.