You are presented with the quiz "Where can cells bound by antibodies more likely be found?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "antigens are found on cancer cells and the cells of transplanted organs" and "antibodies bound to antigen are then measured by RCAT-based amplification of the associated DNA tag". 

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


 

       on cancer cells    