When a normal component of the cells triggers an immune response, that component is called an auto antigen.
当自身正常组织成分可以引起免疫应答时，这种正常组织成分就称为自身抗原。
Normal component
原声例句
Osmosis-神经
英语百科
Tangential and normal components
（重定向自Normal component）
In mathematics, given a vector at a point on a curve, that vector can be decomposed uniquely as a sum of two vectors, one tangent to the curve, called the tangential component of the vector, and another one perpendicular to the curve, called the normal component of the vector. Similarly a vector at a point on a surface can be broken down the same way.
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