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In the long run, a perfectly competitive firm maximizes profit so P = MC = AC.
Antibodies
Proteins produced by the immune system in response to antigens, which help to identify and neutralize foreign objects like bacteria and viruses.
Macrophages
Large white blood cells that are an essential part of the immune system, responsible for detecting, engulfing, and destroying pathogens and dead cells.
Antigens
Foreign substances in the body that trigger an immune response.
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