Antigen
Very low doses of antigen may induce

low zone immunity
low zone tolerance
hypersensitivity
immunological ignorance

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Antigen
CD antigens

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
allow leukocytes to recognize antigen

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Antigen
For specific antigen recognition by T cells,

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

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