You are presented with the quiz "some proteins do what to antigens to cause blood clots" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "antibodies are large, Y-shaped proteins that recognize and bind to antigens" and "some of the antibodies, antophospholipid antibodies, cause blood clots". 

So, what's the best answer to the question?


 

    bind       