Figure 2From: Possible association between common variants of the phenylalanine hydroxylase (PAH) gene and memory performance in healthy adultsHaplotype block structure of the PAH gene. Two haplotype blocks (bolded) were constructed for the 6 SNPs of PAH, using the Haploview program. Numbers in squares represent the 100 × D‘ values. The blank squares mean D′ = 1.0.Back to article page