why lymph nodes and thymus are not comparable?
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The thymus differs structurally from other lymphoid organs in that it does not have lymphatic vessels draining into it. It is not a filter like the lymph nodes, which are situated so that microorganisms and other antigens are exposed to their cells.The nodule differs from a lymph node in that it is much smaller and does not have a well-defined connective-tissue capsule as a boundary. It also does not function as a filter, because it is not located along a lymphatic vessel. ... In the small intestine, collections of lymph nodules are called Peyer's patches
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