An antigen is any substance that elicits an immune response and is then capable of binding to the subsequently produced antibodies .
Antigens are generally protins or polysaccharides but other substances such as nucleic acid can also be antigens .
Antigens in tissues bind antibodies at different cell sites the membrane ,cytoplasm ,nucleus , organelles or a combination of more then one .
Many compounds are antigenic , Because of their large size proteins are ideal for immunization and for binding but polymers can also be antigenic .
The most common antigen that induce antibody production are bacteria and viruses.
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