immune response. red bone marrow, thymus and lymph node. production of lymphocytes. maturation of t lymphocytes or b

immune response red bone marrow thymus lymph node production lymphocyt maturation lymphocytes structure function lymphatic tissues organ locations role system lymphoid anatomical schematic capillary circulatory education mechanism lympha vector immunity bcell illustration medical vessel science human diagram circulation leukocyte medicine blood lymphocyte precursor b cell cel stem development