Figure 3.

Lymphocytes swim in free suspension. (A) Schematic of the setup used to image swimming in suspension with a microscope tilted by 90° and a flow channel oriented vertically. (B) Sequence of images of a cell swimming in the center of the channel in the direction of the x axis. Scale bars, 20 μm. See also Video S4. (C) Speed of active and inactive cells for a distance to the wall larger than 40 μm. Experiments N = 6, cells N >16, and steps N >80. ^∗∗∗p < 0.001 (two-tailed Student’s t-test). To see this figure in color, go online.