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

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

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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,

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

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