T and B lymphocytes are both types of white blood cells involved in the immune response, but they have different roles and functions.

B lymphocytes, also known as B cells, are responsible for producing antibodies that can recognize and neutralize specific pathogens (such as bacteria or viruses) or foreign substances (such as toxins). When a B cell encounters an antigen (a foreign substance that triggers an immune response), it can differentiate into plasma cells, which produce large amounts of antibodies specific to that antigen, and memory cells, which "remember" that antigen and can quickly produce more antibodies if it is encountered again in the future.

T lymphocytes, also known as T cells, do not produce antibodies but are involved in directly attacking infected cells or cancer cells. There are several types of T cells, including helper T cells, which help to activate and coordinate other cells of the immune system, and cytotoxic T cells, which can directly kill infected or abnormal cells.

Another major difference between B and T cells is where they mature. B cells mature in the bone marrow, while T cells mature in the thymus gland. Additionally, B cells can recognize antigens that are present in body fluids, while T cells generally recognize antigens that are present on the surface of cells.

Overall, while both B and T cells are important for the immune response, they have different roles and functions in fighting off infections and other threats to the body.
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