The number of rolling (A) and firmly adhered leukocytes (B) was quantified in different sized, control and TNFα treated venules. Cumulative histograms show the velocity of rolling leukocytes in control (C) and TNFα treated venules (D). In small venules, most of the observed leukocytes were adhered rather than rolling; number of adhered leukocytes in these vessels is significantly higher and the number of rolling leukocytes is significantly lower than in the rest of the vessels. * significantly different from other control groups (p<0.05), ^ significantly different from each other (p<0.05), ** significantly different from each other (p<0.01), n=12–15 venules.