Dendritic cells control lymphocyte entry to lymph nodes through high endothelial venules.

Abstract excerpt

While patrolling the body in search of foreign antigens, naive lymphocytes continuously circulate from the blood, through the lymph nodes, into the lymphatic vessels and back to the blood. This process, called lymphocyte recirculation, provides the body with effective immune surveillance for foreign invaders and for alterations to the body's own cells. However, the mechanisms that regulate lymphocyte...

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