Antigen
CD antigens

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

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Antigen
For specific antigen recognition by T cells,

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

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