(A) Snapshots of chemotaxis of purified neutrophils from healthy human donors at 0, 5 and 10 minutes induced by fMLF, 3, and PBS (as the control) performed on EZ-TAXIScan. (B) The traces of 20 typical migrating neutrophils corresponding to different chemoattractants. (C) The migration speed, (D) directionality and (E) upward directionality of the human neutrophils during chemotaxis from three independent samples, and each sample has 20 cell migration traces. (F) ROS production in the neutrophils (5 × 105) after the addition of fMLF (100 nM), 3 (100 nM), and PBS (as the blank control).