TABLE 1.

Parameter values

Parameter			Source
	0.07 μM	0.07 μM	Present
	0.69 μM	0.69 μM	Present
	8.7 μM−1 s−1	8.7 μM−1 s−1	(Higgs et al., 1999)
	1.3 μM−1 s−1	1.3 μM−1 s−1	(Pollard, 1986)
	8.0 μM−1 s−1	8.0 μM−1 s−1	Model I
	0.71 μM−1 s−1	0.18 μM−1 s−1	Model IV - end
	1.07 μM−1 s−1	0.36 μM−1 s−1	Model IV - side
	0.98 μM−1 s−1	0.27 μM−1 s−1	Model IV - end-plus-side
	0.80 μM−1 s−1	0.33 μM−1 s−1	Model V
	4.2 × 10−4 s−1	4.2 × 10−4 s−1	Model I
	1.05 × 10−9μM−2 s−1	1.05 × 10−9μM−2 s−1	Model II
	2.9 × 10−5μM−6 s−1	2.9 × 10−5μM−6 s−1	Model III
	8.7 × 10−5μM−2 s−1	1.19 × 10−4μM−2 s−1	Model IV - end
	1.1 × 10−5μM−2 s−1	6.8 × 10−6μM−2 s−1	Model IV - side
	8.7 × 10−6μM−2 s−1	0	Model IV - end-plus-side
	0	0	Model V
	0.29 μM−3 s−1	0.158 μM−3 s−1	Model IV - end
	0.082 μM−3 s−1	0.43 μM−3 s−1	Model IV - end-plus-side
	5.4 × 10−4μM−3 s−1	6.0 × 10−4μM−3 s−1	Model IV - side
	5.3 × 10−4μM−3 s−1	4.9 × 10−4μM−3 s−1	Model IV - end-plus-side
	1.44 × 10−3μM−3 s−1	1.22 × 10−3μM−3 s−1	Model V
kage	0.0087 s−1	0.0059 s−1	Model V

In rate constants, subscript gr denotes growth, cap denotes capping, nuc denotes nucleation, br denotes branching, and age denotes aging; superscripts P and B denote pointed and barbed ends, respectively. Pointed-end capping is by Arp2/3 complex and barbed-end capping is by CP. Columns headed and denote fits obtained with these values of