You are presented with the question "proteins foreign to the body can be found where?" and the following answer choices: 
- in the lymph nodes
 - in nerve cells
 - in the kidneys
 - on cancer cells
 - critical organs
 - mouth of rivers
 - Earth orbiting the Sun
 - the skin

Now knowing that antigens are found on cancer cells and the cells of transplanted organs and antigens are proteins foreign to the body, choose the best answer.


 

    on cancer cells     