Antigens are found on cancer cells and the cells of transplanted organs, and antigens are proteins foreign to the body. Given these facts, proteins foreign to the body can be found where among the following options:
- in the lymph nodes
 - in nerve cells
 - in the kidneys
 - on cancer cells
 - critical organs
 - mouth of rivers
 - Earth orbiting the Sun
 - the skin


 

    on cancer cells     