Antigen
For specific antigen recognition by T cells,

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

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Antigen
CD antigens

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

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