The term antibody generally refers to the free (secreted) form, while the term immunoglobulin can refer to either forms. Since they are, broadly speaking, the same protein, the terms are often treated as …

Dec 13, 2025 · Antibody, a protective protein produced by the immune system in response to the presence of a foreign substance, called an antigen. Antibodies recognize and latch onto antigens in …

What do antibodies look like? Each antibody structure consists of two heavy chains and two light chains, which join to form a Y-shaped molecule. Each type of antibody has a different amino acid sequence …

Sep 25, 2025 · IgG: The most abundant antibody found in the body. It can help to block infections caused by bacteria, viruses, parasites, or other disease-causing organisms.

Nov 26, 2025 · Antibody tests do not detect the actual pathogens that cause an infection—they detect the antibodies that are produced in response to the infection. A positive result means "yes," the test …

Jan 13, 2026 · An antibody is a protein component of the immune system that circulates in the blood, recognizes foreign substances like bacteria and viruses, and neutralizes them.

Learn what an antibody is, how it works in the immune system, the main antibody types, and their uses in vaccines, diagnostics, and medical therapies.

Explore the function of antibodies in the immune system, how antibodies are used and produced in research, and how to choose the best antibody for you.

An antibody is a class of protein called an immunoglobulin, which is made by specialised white blood cells to identify and neutralise material foreign to an immune system.

The basic principle of any immunoassay is that a specific antibody binds with its specific antigen, forming an exclusive antibody-antigen complex. This chapter defines what an antigen is and how to …