The effect of complement fragments (A) and fMLP (B) on the apparent stiffness of neutrophils isolated from the BM or the circulating blood.

The apparent stiffness of BM neutrophils before stimulation (time 0) was greater than that of neutrophils in the circulating blood (P < .01). Either complement fragments or fMLP induced an increase in apparent stiffness within 2 minutes (P < .01). n = 5 rats in each group. BM indicates bone marrow; C, circulating.