Table 1. Nondimensional parameter values used in this work unless indicated otherwise.

Parameter	Meaning	Value
Da	Diffusion constant of active nucleators	4 ⋅ 10−2
va	Effective actin polymerization speed	0.1–0.6
kd	Effective filament degradation rate	176
ω	Cooperative binding strength of nucleators	6 ⋅ 10−3
ωd	Detachment rate of active nucleators	0.1 − 0.6
α	Actin polymerization rate	588
ntot	Average total nucleator density	700
L	System length	1.3
Ng	Number of grid points per dimension	256
${\omega }_0^{-1}$	Time scale	91.6 s
$\sqrt{D_i/{\omega }_0}$	Length scale	63.5 μm
DΨ	Phasefield relaxation / surface tension coefficient	5 ⋅ 10−3
κ	Phasefield timescale modifier	118
ϵ	Area conservation strength	8
β	Actin-membrane interaction coefficient	5.75 ⋅ 10−3
A0	Mean cell area	0.083

The length and time scales are chosen such that the ensuing dynamics is comparable to that of immature dendritic cells [10].