| http://www.w3.org/ns/prov#value | - The main secondary lymphoid tissues, in which adaptive immune responses are initiated, are the lymph nodes, spleen, and mucosa-associated lymphoid tissues such as tonsils, Peyer's patches, and the appendix. ??? ??? ??? Lymphoid progenitor Stem cell in bone marrow cell that gives rise to all lymphocytes. ??? ??? ??? Lysosome A membrane-bound, acidic organelle abundant in phaogocytic cells, which co
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