Figure 4. Tracking one rolling leukocyte along the venular wall to simply estimate the rate of leukocyte rolling in a rat mesenteric venule.

Compared to a former panel, the relative vertical distance is 29.3 μm (b–a), 34.5 μm (c–b) and 42.5 μm (d–c), respectively. The average angle between vessels and horizontal direction is 113°. Time interval of sequent image is 1 second. Scale bar: 30 μm.