The parts at the end of the Y's are variable.

形的末端部分是可变的

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So, what we end up having is three of these pi -- 2 p y 2 p y bonds, we can have one between these two carbons here.

我们剩下的有三个π键-,2py2py键，在这两个碳原子之间会有一个。

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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

耶鲁公开课 - 生物医学工程探索课程节选