Lymphocytes
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Immune cells are formed or matured in the bone marrow. This is where stem cells differentiate into various types of immune cells, such as lymphocytes (B cells and T cells) and myeloid cells (neutrophils, macrophages, etc.). Some immune cells, like T cells, undergo further maturation in the thymus.
B cells and T cells migrate to secondary lymphoid organs such as lymph nodes and spleen to carry out their immune functions. Here, they encounter antigens, undergo activation, and differentiate into effector cells to mount an immune response.
Following a primary immune response, memory cells are generated from activated B and T cells. These memory cells can recognize the same pathogen if encountered in the future, leading to a faster and stronger secondary immune response. Memory cells are vital for the immune system's ability to provide long-lasting protection against specific pathogens.
Lymphocytes(T and B cells)
lymphocytes (t cells and b cells)