Effects of DEK knockout (−/−) on hematopoietic progenitor cells. Results are shown for these cells in S-phase of the cell cycle, as determined by high specific activity tritiated thymidine kill technique, when stimulated with 5% pokeweed mitogen spleen cell conditioned medium (PWMSCM), SCF (50ng/ml), and EPO (1U/ml) in methylcellulose culture (A) and when stimulated with GM-CSF (10ng/ml) alone and in combination with SCF in agar culture (B) [6]. Results are given as mean±1SEM of 3 mice per group. *, significantly different from control medium (p<0.05), as assessed by 2 tailed t test.