Fact 1: Antigens are found on cancer cells and the cells of transplanted organs.

Fact 2: Antibodies bound to antigen are then measured by RCAT-based amplification of the associated DNA tag.

Given the two facts above, answer the question "Where can cells bound by antibodies more likely be found?" with the following options: 
- critical organs
 - colder and wetter
 - the environment
 - Earth orbiting the Sun
 - Veins and arteries.
 - epidermis and dermis
 - on cancer cells
 - the skin


 

       on cancer cells  