Mutations in the genes SLC24A5 and SLC45A2 are largely responsible for European pigmentation, showing only single amino acid differences between Europeans and West Africans. (pennstatehealthnews.org)
«We traced this reduced sensitivity to a single amino acid difference among the more than 600 amino acids that comprise fly and mammalian serotonin transporters.» (sciencedaily.com)
They have discovered that a single amino acid difference in the structure of histone H3.3 enables it to serve as a kind of memory device for the cell, marking genes that need to remain active. (sciencedaily.com)