The cells that produce antibodies are plasma cells.
Plasma cells are differentiated from B-cells, and when B-cells are stimulated by antigens, they deform in shape, increase in size, and transform into plasma cells, which can then secrete the corresponding antibodies, a process called humoral immune response.
Plasma cells are the main source of antibodies, plasma cells produce antibodies in the process of antigen invasion of the body, phagocytosis, phagocytosis of antigens presented to the T cells, and then presented by the T cells to the B cells, which led to the division and differentiation of B cells into plasma cells and memory cells. For example, the hepatitis B vaccine produces antibodies specifically directed against the hepatitis B surface antigen, also known as hepatitis B surface antibodies. After the production of antibodies, when the human body comes into contact with the hepatitis B virus again, such as being infected by others, the hepatitis B surface antibodies in the body will recognize the surface antigen carried by the hepatitis B virus that enters the body, and play the role of antibodies to protect the person from hepatitis B.