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

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
antigen is hidden from the immune system in macrophages
innate immune effectors are eliminating antigen

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Antigen
CD antigens

allow leukocytes to recognize antigen
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

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