Quantification of A4GALT transcripts. (A) Transcript levels measured by TaqMan gene expression assay in 5 P₁ and 5 P₂ individuals shows a significant difference. Target quantities were normalized to 18S ribosomal RNA. (B) A4GALT transcript levels depend on P¹/P² genotype. Gene expression levels in peripheral blood were determined with the TaqMan assay in 15 samples of the genotypes P¹P¹ (n = 5), P¹P² (n = 5), and P²P² (n = 5). Target quantities were normalized to 18S ribosomal RNA. Both graphs show the mean values and error bars represent SEM values. The y-axis represents the percentage of the highest value obtained. Significance levels are shown as asterisks above the bars.