Less than 5 percent of the mutations tied to Alzheimer's are fully penetrant, meaning that they guarantee a person will get the disease, he said.

他是麻省综合医院的基因学专家。与阿兹海默症有关的突变中，少于5%的情况是完全显性的，显性的意思是一定会得脑类疾病，他如是说道。