Effects of a single injection of PEG-rHuMGDF on peripheral blood cell recovery in irradiated myelosuppressed mice. One hour after irradiation at a dose of 3.5 Gy, mice were intravenously given 1 (▵), 8 (▴), 80 (□), or 640 (▪) μg/kg PEG-rHuMGDF, or vehicle (○). The data represent 1 of 2 separate experiments.