It is the B-cells.
Antibodies and /or anti - antigen.
antibodies
Antigen. An antigen is a small piece of a pathogen, such as a virus or bacteria, that triggers the immune system to produce antibodies to fight off the infection. This immune response helps protect the body from further exposure to the pathogen in the future.
Monoclonal antibodies are commonly used to fight a large number of diseases including cancer. The monoclonal antibodies fight the disease by targeting a certain antigen and recruiting the body's natural immune system to destroy the antigen-infected cells.
lymphocytes make antibodies by first getting the antigen marker from a pathogen. Then, using a 'toolkit' of various protein fragments, they use the marker as a 'blueprint' to make the antibody.
Antibodies
No, antibodies are produced by your body to fight infection.
An antigen is a body's system for creating antibodies to fight infection. A pathogen is an infectious agent (or germ).
Function of Antibodies is to fight against the antigens to protect the body
B Lymphocytes
When you get a disease and fight it off, your body produces specific antibodies for that disease, tiny organisms meant for that specific disease. While those antibodies remain in your system, you can't contract that same disease again. Vaccinations are modified versions of the disease that they wish to produce immunity against. They produce a very toned-down effect of the actual disease, but cause your body to create the same antibodies, as if you'd had the real thing.
An antigen is a substance that can trigger an immune response in the body, such as proteins on the surface of bacteria or viruses. A pathogen, on the other hand, is a type of antigen that can cause disease in the host organism by invading and damaging tissues. Not all antigens are pathogens, but all pathogens are antigens.