Gnai2-deficient mice cannot induce leukocyte arrest in postcapillary venules of the cremaster muscle in response to LTB₄. Number of adherent leukocytes in cremaster muscle postcapillary venules of Gnai2^−/− mice and Gnai2^+/+ mice after intravenous injection of 5 μg LTB₄. Data were recorded and analyzed for 1 minute starting 15 seconds after CXCL1 injection. Data presented as means plus or minus SEM from 4 mice. ^#P < .05.