Antigen
The antibiotic penicillin is a small molecule that does not induce antibody formation. However, penicillin binds to serum proteins and forms a complex that in some people induces antibody formation resulting in an allergic reaction. Penicillin is therefore

both an antigen and a hapten
an antigen
an immunogen
a hapten

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Antigen
CD antigens

allow leukocytes to recognize antigen
are each expressed on only one cell type
function as receptors for cytokine and CAMs
are expressed on immune cells to mark them for separation

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Antigen
For specific antigen recognition by T cells,

MHC molecules are not required
antigen exposure during T cell maturation is required
denaturation of antigen does not reduce epitope recognition
antigen is bound by a T cell membrane antibody

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