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DPP IV activity in human thymocyte subsets distinguished by their CD4 and CD8 expression patterns. Values are means of eight separate determinations of DPP IV activity (top) and CD26 expression (bottom) in unstimulated, freshly isolated human thymus lymphocytic cells. ∗, P ≤ 0.05 compared to other subsets within either the 1- or the 10-min group. Error bars indicate standard deviations.
