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The T-cell activation antigen CD26 (dipeptidyl peptidase IV, DPIV) is a proline specific protease thought to be involved in regulation of the immune response. Several former results characterized this ectoenzyme as a possible accessory molecule of the T-cell surface. The molecular events of lymphocyte activation mediated by this enzyme, as well as the physiological ligands of dipeptidyl peptidase,...
CD26 is a well-known activation marker on T cells and natural killer (NK) cells [1]. It is identical with the ectopeptidase dipeptidyl peptidase IV (DP IV). The expression of CD26 on B cells has been discussed controversially [2,3]. We have studied the expression of this enzyme on B cells from the peripheral blood of healthy donors and of CVID patients, on cells of the Daudi Burkitt line and the...
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