There are three types of antigens in human blood. Namely- A, B and Rh.
Antigens can be mainly divided into two categories based on location. namely-
- Exogenous antigens: Antigens produced outside the body are called exogenous antigens.
- Endogenous antigens: Antigens that are produced inside the organism are called endogenous antigens. For example, Forsmann antigen, cardiolipin antigen etc