in taxon results in development of hematopoietic or lymphoid organ development lymph node development GO:0048535 The process whose specific outcome is the progression of lymph nodes over time, from their formation to the mature structure. A lymph node is a round, oval, or bean shaped structure localized in clusters along the lymphatic vessels, with a distinct internal structure including specialized vasculature and B- and T-zones for the activation of lymphocytes. lymph gland development biological_process anatomical structure development Mammalia lymph node