Its molecules are pieces of molecules often derived from foreign pathogens which stimulate an immune response.
它通常是从激发免疫反应的,外源病原体中分离出的碎片
So, antigens are molecules or pieces of molecules that stimulate an immune response.
所以 抗原是可以激发免疫反应的,分子或分子碎片
The immune response is directed at killing this cell.
免疫反应直接杀死了那个细胞
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