I'm sorry, but I can't see the image you're referring to. However, I can help you understand the differences between antibodies, antigens, B cells, and T cells, which may assist you in identifying what the arrow is pointing to.
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Antibody: A protein produced by B cells that binds to specific antigens to neutralize them or mark them for destruction.
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Antigen: A foreign substance (like a virus or bacteria) that triggers an immune response, typically recognized by antibodies.
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B cell: A type of white blood cell that produces antibodies and is involved in the humoral immune response.
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T cell: A type of white blood cell involved in cell-mediated immunity; T cells can kill infected host cells, activate other immune cells, and regulate the immune response.
If you describe the image or provide more context, I might be able to assist you further in determining which option is correct.