Antigen
During the lag period between antigen contact and detection of adaptive immunity,

innate immunity blocks the activation of adaptive immune effector cells
innate immune effectors are eliminating antigen
antigen is hidden from the immune system in macrophages
new B and T cells with the appropriate antigen specificity must be produced in the bone marrow

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Antigen
CD antigens

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

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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
MHC molecules are not required
antigen is bound by a T cell membrane antibody

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