PERBEDAAN ANTARA ANTIGEN DAN ANTIBODI

Difference between antigen and antibody.

Antibodies are also known as immunoglobulins. The shape of the molecule resembles the letter Y with the building blocks of a protein. Antibodies help the body defend itself against foreign substances called antigens. An antigen is a substance that stimulates the immune system to produce antibodies.

Antigens can be bacteria, viruses, or fungi that cause infection and disease.

Figure 1: Difference Between Antigen and Antibody

Below are some of the differences between antigen and antibody:

	antigens	antibody
1	Antigens are usually made of proteins, but they can also be made of fats, carbohydrates, and nucleic acids.	Antibodies are made of proteins.
2	Stimulates the formation of antibodies.	The antigen binds to a specific site on the antigen.
3	There are three main forms of antigens.  (exogenous, endogenous and autoantigen)	There are 5 main forms of antibodies, namely immunoglobulins M, G, E, D and A.
4	The area where an antigen interacts with an antibody is called an epitope.	The region of an antibody that specifically binds to the epiloop is called a paraloop.
5	cause disease or allergic reactions	Protects the body by preventing the movement or lysis (destruction) of antigenic substances.

To better understand the difference between an antigen and an antibody, take a look at the image below!

Figure 2: Leukocytes (B cells), pathogens (pathogens)

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