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

Fact 2: Organs such as the stomach and liver also begin to develop.

Given the two facts above, answer the question "antigens are found on cancer cells and the cells of transplanted what?" with the following options: 
- personality
 - density
 - alveoli
 - lungs
 - the skin
 - epidermal
 - livers
 - digestion


 

       livers  