Having one copy of gene variant , APOE e4 , means 29 percent risk of Alzheimer 's . People with APOE e4 gene variant showed declines beginning in their 50s . is that there 's no clear way to reduce Alzheimer 's risk . Title: Why do we have to wait for the sun to rise before it can be used as a light source?
Having one copy of gene variant , APOE e4 , means 29 percent risk of Alzheimer 's . People with APOE e4 gene variant showed declines beginning in their 50s . Title: Why do we have to wait for the sun to rise before it can be used as a light source?