Table 1.

Mean rates (μm/min ± SEM) of protrusion and retraction of lamellipodia at the active edges of nontransformed IAR-2 cells and ras-transformed C4 cells before and after cell–cell contact

Cell type	Before contact		After contact
	Protrusion	Retraction	Protrusion	Retraction
IAR-2	0.78 ± 0.12	0.66 ± 0.10	0.42 ± 0.07	0.25 ± 0.07
C4	1.08 ± 0.18	1.20 ± 0.20	1.43 ± 0.28	0.84 ± 0.18