Light chains are proteins produced by what type of cells?

Light chains are indeed proteins produced by plasma cells, which are differentiated B-lymphocytes. When B-lymphocytes encounter an antigen, they can proliferate and differentiate into plasma cells, where they then produce and secrete antibodies. Antibodies are composed of heavy and light chains, and the light chains play a crucial role in the structure and function of the antibody molecules.

Plasma cells are specialized for the production of these antibodies and are a key component of the adaptive immune response. They are responsible for generating the specific immune response needed to target pathogens effectively. The production of light chains is essential for forming the complete Ig molecule, which consists of two heavy chains and two light chains, allowing it to function effectively in neutralizing antigens.

Other cell types mentioned, such as T-lymphocytes and macrophages, do not produce light chains. T-lymphocytes are mainly involved in cell-mediated immunity and do not release antibodies, while macrophages are primarily involved in phagocytosis and presenting antigens to T-lymphocytes. Therefore, the production of light chains is specifically a function of plasma cells, which makes this choice the correct answer.