Antigen
A virus vaccine that can activate cytotoxic T cells must contain

a high dose of virus particles
virus peptides
live virus
an adjuvant to stimulate T cell division

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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
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

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Antigen
CD antigens

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

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