ANATOMY

Detailed explanation-1: -Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria. Nonliving substances such as toxins, chemicals, drugs, and foreign particles (such as a splinter) can also be antigens. The immune system recognizes and destroys, or tries to destroy, substances that contain antigens.

Detailed explanation-2: -An antigen is any kind of marker-like a protein or string of amino acids-that your immune system can recognize. If this definition seems a little vague to you, you’re not alone. Let’s dig in further. Antigens are usually proteins or sugars (polysaccharides) found on the outside of things like cells or viruses.

Detailed explanation-3: -An antigen is a molecule. A pathogen is an infectious agent. Antigens are usually peptides or polysaccharides. Viruses, fungi, bacteria and other disease-causing microorganisms. Sources of antigens can be of biological or non-biological origins.

Detailed explanation-4: -Any substance capable of eliciting an adaptive immune response is referred to as an antigen (antibody generator).

Detailed explanation-5: -(AN-tih-jen) Any substance that causes the body to make an immune response against that substance. Antigens include toxins, chemicals, bacteria, viruses, or other substances that come from outside the body. Body tissues and cells, including cancer cells, also have antigens on them that can cause an immune response.