rn t If you have specific genes, namely two ApoE4 (Apolipoprotein E) genes you are more likely to be affected by Mercury. rn t If you have the ApoE2 gene, you are less likely to be affected. rn t The difference between these two genes is that the ApoE4 gene has two arginine aminoacids and the ApoE2 has two cysteine aminoacids. rn t Cysteine gives you protection from mercury, whereas arginine does not. rn