- Antigens are toxic proteinaceous substances. However, polysaccharides and lipoproteins can also be antigens.
- Its molecular weight is 10,000 daltons. But the best antigen has a molecular weight of 100,000 daltons.
- It can bind to antibodies.
- It may contain multiple epitopes or determinant groups.
- Different organisms of the same species have species-specific antigens.
- Organ specificity antigens are present in certain tissues or organs.