Answer:
Antigens
Step-by-step explanation:
Herd immunity is not something found on the surface of a cell. It is something a whole herd or population develops in order to fight some disease.
Phagocytes are not found on the surface of any cell since they are cells themselves. They protect the body by ingesting particles, bacteria, and dead cells.
Lymphocytes are white blood cells
Endospores are made by bacteria and not located on the cell surfaces.