Because at the end of the Y, there's a special region of the antibody, the antigen-binding region, that is highly tuned for binding to the antigen that stimulated them.

因为Y形抗体的末端,是抗体上非常特殊的一个区域,即抗原结合区域,这一区域高度特异性地,用于结合激活免疫的抗原

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