Microcheck 162

The lymphatic vessels carry the fluid collected from tissues to the lymph nodes; these and other secondary lymphoid organs are where lymphocytes gather to encounter antigens that have entered the body. The primary lymphoid organs, the bone marrow and thymus, are where hematopoietic stem cells destined to become B cells and T cells mature.

■ Why would it be unwise to suppress the symptom of a "swollen gland"?

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