Antigen
For specific antigen recognition by T cells,

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

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Antigen
CD antigens

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

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