Effect of pretreatment with anti–LFA-1 on the mobilization of progenitor cells by IL-8. Mice were pretreated with a single IP injection of 100 μg of anti–LFA-1 (H154.163, n = 20), 300 μg of anti–VLA-4 (R1/2, n = 10), 300 μg of anti–ICAM-11 (YN1/1.7, n = 8) or saline (n = 20). The following day 30 μg of IL-8 was administered as a single IP injection 20 minutes before harvesting peripheral blood. Results are expressed as mean ± SD. *,P < .01 as compared with saline pretreated controls.