Antigen
The ability of an antigen to induce an immune response does not depend on the antigen's

ability to enter the thyroid
size
dose
degree of aggregation

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Antigen
For specific antigen recognition by T cells,

denaturation of antigen does not reduce epitope recognition
MHC molecules are not required
antigen exposure during T cell maturation is required
antigen is bound by a T cell membrane antibody

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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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