Considering the group of 39 participants (Table 1) with parasite density (PD) (1.2–2.2 × 103 parasites/μL of blood), and no detectable BLL, there was a perfectly functioning heme biosynthesis system (FEP <10μg/ dL), with no anemia (mean Hb=10.4 g/ dL). Here, GSTM1 is linked to anemia.