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 …

An antibody is a protein produced by the immune system to fight pathogens like viruses and bacteria. Ever wondered how antibodies specifically identify and stop infections? Learn how these powerful …

Aug 3, 2023 · Each antibody has two light chains that are identical and only one of the two (lambda (λ) and kappa (κ)) light chains is present per antibody in mammals; therefore either of the chains can …

Sep 17, 2022 · IgG is the most abundant antibody, accounting for 75%-80% of all antibodies in the body. It either tags an antigen for removal or it stimulates the production of toxins or other responses to …

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 …

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.

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 …