Antigens can be
A. proteins.
B. large polysaccharides that protrude from virus surfaces or foreign cells.
C. blood or tissue cells from organisms of the same or different species.
D. all of the above.
Answer:D
Antigens can be
A. proteins. B. large polysaccharides that protrude from virus surfaces or foreign cells. C. blood or tissue cells from organisms of the same or different species. D. all of the above.