Direct observations of the kinetics of migrating T cells suggest active retention by endothelial cells with continual bidirectional migration.

The proportion of adherent cells undergoing one or more transit over 6 min was reduced from 14.2 ± 4.8% to 6.9 ± 2.2%, and the proportion undergoing more than one transit was reduced from 6.9 ± 2.3% to 3.9 ± 1.8% (mean± sem from three experiments), although these trends did not reach statistical significance.

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