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

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

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

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

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Antigen
For specific antigen recognition by T cells,

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

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