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In the context of human physiology, antibodies are-

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A
Proteins
💡 Explanation:

Antibodies, also known as immunoglobulins, are large, Y-shaped proteins produced by plasma cells that are used by the immune system to neutralize pathogens. They are not carbohydrates, lipids, or sterols. Their specific structure allows them to bind to specific antigens on the surface of bacteria or viruses.

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