TABLE 1.

DPP IV levels and CD26 expression in normal peripheral blood mononuclear cells^a

Backgated populationb	% Cells positive for enzyme or protein at indicated time of incubation
	DPP IV			CD26
	0 min	1 min	10 min	0 min	1 min	10 min
CD4	1.46 ± 0.24	9.06 ± 1.76	91.63 ± 2.46	65.23 ± 1.67	69.43 ± 2.22	68.43 ± 2.04
CD8	2.91 ± 0.46	8.83 ± 1.20	90.04 ± 3.31	20.87 ± 0.76	19.49 ± 0.78	19.30 ± 0.74
CD19	2.14 ± 0.85	2.72 ± 1.06	51.07 ± 4.00	0.32 ± 0.12	0.52 ± 0.12	0.66 ± 0.22
CD56	5.11 ± 1.13	15.26 ± 4.94	93.46 ± 1.21	2.00 ± 0.21	2.14 ± 0.28	2.08 ± 0.32
CD26	2.80 ± 0.66	5.95 ± 2.02	93.07 ± 0.93

^aDPP IV measurements were made by using a four-color flow cytometry assay as described in Materials and Methods. Values are means ± standard deviations (n = 10). 

^bBackgating analysis of the listmode files was performed on the indicated populations. See Materials and Methods for description.