Immunoglobulins, also known as antibodies, are Y-shaped proteins produced by plasma cells that recognize and help eliminate pathogens such as bacteria and viruses. They have a variable region that recognizes antigens and a constant region that interacts with other components of the immune system. The five major classes of immunoglobulins are IgG, IgM, IgA, IgD, and IgE, which have different structures and functions in the immune response.
