Changes in hematologic parameters in response to Flt3L administration. Flt3L was administered to 3 rhesus monkeys (100 μg/kg/d) for 10 days. There was no significant change in WBC during the 10-day course of treatment, but the percentage of lymphocytes rose significantly by day 10, returning to within the normal range 4 days after the discontinuation of growth factor administration. Error bars represent SD.