Marrow cells were incubated with TPO (25 ng/mL) and SDF-1 (200 ng/mL) in the presence or absence of 3 μM T22 or 3 μM 1-9 (P2G) SDF-1. The data represent the mean ± SEM in triplicate plates. Similar results to those shown in experiment 1 were obtained in 3 additional experiments.

P < 0.01.

P < 0.05.

P < 0.02.

P = 0.1 for the comparisons shown.