Visual genotype of the UGT2B15 exon 6 region. Each column indicates one SNP while each row denotes one individual. Blue, red, yellow, and grey represent homozygous of common allele, heterozygous, homozygous of rare allele, and missing data, respectively. DY, E, and X indicate YRI, CEU, and ASN HapMap populations, respectively. All positions refer to the genome sequence (build 36) for chromosome 4.