Antigens
❑Most are proteins or large polysaccharides from a foreign
organism.
Microbes
-Capsules
-cell walls
-toxins
-viralcapsids
-flagella
Non microbes
*Pollen
*eggwhite
*redblood
*cellsurface molecules
*serum proteins and
*surface molecules from
transplanted tissue.
Epitope
❑Small part of an antigen that interacts with an
antibody.
❑Any given antigen may have several epitopes.
❑Each epitope is recognized by a different antibody.