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

innate immune effectors are eliminating antigen
antigen is hidden from the immune system in macrophages
innate immunity blocks the activation of adaptive immune effector cells
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 expressed on immune cells to mark them for separation
function as receptors for cytokine and CAMs
are each expressed on only one cell type
allow leukocytes to recognize antigen

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