Antigen
Antigen, when injected in the body activates its specific lymphocytes in the

blood circulation
MALT (mucosa associated
draining lymph nodes
spleen lymphoid tissue

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Antigen
CD antigens

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

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