<b>Frequency distribution of genotypes for the </b><b><i>Fok</i></b><b>I SNP differs between Africans and Whites, but not between Africans, from the International HapMap Project.</b>

aHapMap population data were obtained from the International HapMap Project, including all HapMap Phase I, II and III samples from four populations: Individuals from the Centre d′Etude du Polymorphisme Humain (CEPH) collected in Utah, USA, with ancestry from northern and western Europe (CEU, n = 113); Yoruba in Ibadan, Nigeria (YRI, n = 112); Luhya in Webuye, Kenya (LWK, n = 86) and Maasai in Kinyawa, Kenya (MKK, n = 142).