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

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

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Antigen
CD antigens

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

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