Antigen

A molecule, often a protein on a cell or pathogen, that an antibody can recognise and bind to.

A molecule, often on the surface of a pathogen, that is recognised by the immune system and stimulates a specific immune response.

A molecule with a particular shape to which a specific antibody can bind; in a pregnancy test, hCG acts as the antigen.

A molecule, often on a cell’s surface, with a shape that a particular antibody can recognise and bind to.

A molecule, often a protein, with a particular shape that can be recognised and bound by an antibody.

A molecule that can trigger an immune response and to which a specific antibody can bind.

A molecule that an antibody can recognise and bind to; it may be on a cell or free in a body fluid.

A molecule, often on the surface of a pathogen, that is recognised as foreign and triggers a specific immune response.

A molecule that is recognised as foreign and stimulates an immune response, including the production of antibodies.

A molecule recognised by an antibody because its binding site has a complementary shape.

A molecule that is recognised by an antibody and may trigger an immune response; antigens can occur on the surfaces of cells.