Our measurements show a higher absolute expression of ALAS2 mRNA in patients with EPP (Figure 2A) (4013.5 ± 2638.1 copies/μl) as compared to the controls (1739.8 ± 1193 copies/μl p < 0.009). This evidence concerns the gene ALAS2 and autosomal erythropoietic protoporphyria.