Influence of DPP4 on DEK activity. Shown are effects of full length (FL) – and DPP4-treated (=likely truncated, TR) DEK, alone and in combination, on 5×104 C57Bl/6 mouse BM cells/ml pretreated with Diprotin A, an inhibitor of DPP4, and stimulated with GM-CSF (Exp#1) or GM-CSF+SCF (Exp#2) (See reference 6 for details of such studies done with other growth modulating proteins). Results are given as mean±1SEM. *, significantly different from control medium (p<0.05); ND= not done