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Department of Pathology, University of Texas Southwestern Medical Center, Dallas 75235.
The expression of immunity, both protective and pathologic, is critically dependent on the appropriate distribution of 'lymphoid resources' among the tissues of the body. The 'homing' mechanisms mediating this distribution have proven to have an astounding plasticity--directing, under strict microenvironmental control, the selective recruitment of specific lymphocyte subsets to the various secondary lymphoid tissues and extralymphoid immune effector sites. The past year has seen significant progress in our understanding in three areas: the molecular basis of lymphocyte interactions with endothelium, providing new insight into the complex multistep process of lymphocyte extravasation; the role of extravascular matrix and cells in retaining lymphocytes within tissues; and the mechanisms by which local microenvironments differentially regulate adhesion molecule expression and function so as to provide for site-selective lymphocyte homing.
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