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Immunoglobulin G

Definition: Immunoglobulin G (IgG) is the most common type of antibody found in the blood and essential for the immune system's defense against pathogens. It plays a crucial role in providing long-term protection against infections.

Senses and Usages:

1. Biochemistry:

Noun: In biochemistry, immunoglobulin G refers to a class of protein molecules produced by plasma cells to neutralize and eliminate foreign substances such as bacteria, viruses, and toxins.

Example Sentence: The presence of immunoglobulin G in the blood indicates a previous exposure to the virus.

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2. Medicine:

Noun: In medicine, immunoglobulin G refers to a type of immunoglobulin therapy where therapeutic antibodies, specifically IgG, are administered to individuals with compromised immune systems to enhance antibody production and fight off infections.

Example Sentence: The patient with primary immunodeficiency requires regular infusions of immunoglobulin G.

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Note: For the remaining senses and usages, please check the Merriam-Webster dictionary entry for the term "immunoglobulin G".