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Signals for lymphocyte egress

Lymphocyte egress from lymph nodes is thought to require signals on T cells for the initiation of exit movement. Another possibility is that signaling instead opens endothelial 'gates' through which lymphocytes pass.

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Figure 1: In untreated lymph nodes (blue cells, left), random lymphocyte migration proceeds at a velocity of 10–12 μm/min (arrows) in the cortex (top; reddish shading) and 6.5 μm/min in the medulla (light tan).

Katie Ris

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Ley, K., Morris, M. Signals for lymphocyte egress. Nat Immunol 6, 1215–1216 (2005). https://doi.org/10.1038/ni1205-1215

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