Antigen
CD antigens

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

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Antigen
For specific antigen recognition by T cells,

MHC molecules are not required
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

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