Antigen
Very low doses of antigen may induce

low zone tolerance
hypersensitivity
immunological ignorance
low zone immunity

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Antigen
For specific antigen recognition by T cells,

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
MHC molecules are not required

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Antigen
CD antigens

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

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