Antibody - Wikipedia
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 synonymous. [4]

Antibodies: Definition, Types & Function - Cleveland Clinic
An antibody is a protein produced by your immune system to attack and fight off these antigens. How do antibodies fight off antigens? The molecules on the surfaces of antigens differ from those found naturally in your body. So, when an antigen enters your body, your immune system recognizes it right away.

Antibody | Definition, Structure, Function, & Types | Britannica
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 order to remove them from the body. Learn more about the function and structure of antibodies in this article.

What Is an Antibody? Structure, Function, and Types
An antibody molecule is a glycoprotein that adopts a characteristic flexible Y-shape. This structure is composed of four polypeptide chains: two identical heavy chains and two identical, shorter light chains.

Physiology, Antibody - StatPearls - NCBI Bookshelf
The five antibody classes produced by the body include IgG, IgM, IgA, IgD, and IgE. IgM is the first antibody produced and acts as a B-cell surface immunoglobulin (Ig).

The 5 Types of Antibodies - Verywell Health
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 has detected the antibody or antigen.

Antibody - National Human Genome Research Institute
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.

Antibodies: Definition, Types, and Function - Health
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.

Antibody Basics: The Complete Guide | Antibodies.com
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.

Antibody: MedlinePlus Medical Encyclopedia
An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include microorganisms (bacteria, fungi, parasites, and viruses) and chemicals.