We examined the binding of mononuclear cells to blood vessels in the rheumatoid arthritis synovial membrane. Two of 4 synovia that had lymphocyte-rich areas contained blood vessels adhesive for mononuclear cells. These reactive vessels showed striking similarities to high endothelial venules of the paracortical region of lymph node, where normal lymphocyte-endothelial cell adhesion and lymphocyte emigration into tissue occurs.
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Oppenheimer‐Marks et al. (1986) studied this question.