Antigen
Very low doses of antigen may induce

immunological ignorance
hypersensitivity
low zone immunity
low zone tolerance

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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,

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

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