Antigen
CD antigens

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

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

innate immune effectors are eliminating antigen
innate immunity blocks the activation of adaptive immune effector cells
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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