Table 1. Average particle velocities in 8.5 µM profilin-actin, 100 nM Arp2/3.

Particle	[ATP]	[Cofilin]	[CP]	Tail Growth
	mM	µM	nM	µm/min
Nanofibers	0.38	–	75	0.08±0.05 (14)
Nanofibers	0.38	–	100	0.14±0.05 (24)
Nanofibers	0.38	–	200	0.11±0.06 (20)
4.5 µm Beads	0.38	2.0	200	0.51±0.04 (10)
4.5 µm Beads	0.38	–	200	0.48±0.12 (10)
4.5 µm Beads	0.2	–	200	0.17±0.02 (7)