“…4,5 The apoE gene, located on human chromosome 19, is 3.7 kb in length and contains four exons. The gene is polymorphic with three common alleles, 32,33, and 34, resulting in six main genotypes ( 32 32, 32 33, 32 34, 33 33, 33 34, and 34 34). 4,6 Each apoE gene polymorphism also has an effect on the level of its gene product; 32 is associated with greater concentrations of apoE and 34 with lower concentrations.…”