ALS

You may have heard of this gene, which is called APOE, because of its known effect on Alzheimer’s disease risk. It codes for a protein called APOE (apolipoprotein E) that is involved in cholesterol transport and processing, and it has three variants: e2, e3, and e4. Of these, e3 is the most common by far, but having one or two copies of the e4 vari

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