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 immunogen
a hapten
an antigen

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Antigen
During the lag period between antigen contact and detection of adaptive immunity,

new B and T cells with the appropriate antigen specificity must be produced in the bone marrow
innate immunity blocks the activation of adaptive immune effector cells
innate immune effectors are eliminating antigen
antigen is hidden from the immune system in macrophages

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Antigen
For specific antigen recognition by T cells,

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

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