Population differences of personal OR protein allele counts. A) Distribution of the OR missense allele count frequencies in Africans (red), Europeans (brown) and Asians (blue). The black line indicates the average distribution for the whole population. B) Haplotype allele frequencies for six OR genes that show the highest inter-population variability. Only alleles with 1000 Genomes frequency > 10% in the entire human population are shown. AFR- Africans, ASN- Asians, EUR- Europeans.