Beta ( in the form of beta - amyloid plaques ) and tau ( in the form of tau tangles ) are the physical manifestations of alzheimer ' s 贝塔（以贝塔-淀粉样斑块的形式）和陶（以陶蛋白缠结的形式）是痴呆症的物质表征。
2.
Amyloid plaques form when a molecule called amyloid precursor protein ( app ) is chopped up by two enzymes known as beta - secretase and gamma - secretase 当一种叫淀粉样前体蛋白（ app ）的分子被两种酶? ?分别叫作贝塔-分泌酶和伽玛-分泌酶? ?切断时就形成了淀粉样斑块。
