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Pierre can produce either a combination of 20 bow ties and 30 neckties or a combination of 35 bow ties and 15 neckties.If he now produces 35 bow ties and 15 neckties, what is the opportunity cost of producing an additional 15 neckties?
Null Cells
Lymphocytes that lack surface markers distinctive of T or B cells, often associated with natural killer cell activity.
Variable Regions
Parts of antibodies that differ from one antibody to another, enabling them to bind to a specific antigen.
T-cell Receptors
These receptors on the surface of T-cells recognize and bind to antigens presented by other cells, initiating an immune response.
Epitopes
Distinct regions on an antigen that the immune system identifies, particularly through antibodies, B cells, or T cells.
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