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

Fact 2: Cancerous melanoma Skin melanoma is one of the most cancerous skin cancers.

Given the two facts above, answer the question "Where can antigens be found?" with the following options: 
- Contaminated wounds
 - the environment
 - Most plants
 - our nearest star
 - Earth orbiting the Sun
 - Veins and arteries.
 - an area swollen with pus
 - skin melanoma cells


 

        skin melanoma cells 