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<p>and innate immunity. The <a href="page.php?w=white_pulp">white pulp</a> houses <a href="page.php?w=T_lymphocytes">T lymphocytes</a> in <a href="page.php?w=periarteriolar_lymphoid_sheaths">periarteriolar lymphoid sheaths</a> (PALS) situated around central arterioles and <a href="page.php?w=B_lymphocytes">B lymphocytes</a> in follicles adjacent to PALS. This positioning allows the B lymphocytes to encounter blood-borne <a href="page.php?w=antigen">antigen</a>s, which activate B cells to differentiate into plasma cells. Plasma cells then secrete</p><p>
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