Which protein dissolved in plasma fights pathogens (disease-causing agents)?

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Antibodies, also known as immunoglobulins (Ig), are proteins produced by the immune system in response to the presence of antigens (foreign substances) such as pathogens (disease-causing agents). Antibodies help to neutralize or destroy the antigens, thereby preventing or reducing the severity of the infection. Antibodies are dissolved in plasma and are a crucial component of the body's defense against infections.

Which Protein Dissolved in Plasma Fights Pathogens (Disease-Causing Agents)