Table 1.

Default parameter values used in the simulations

Symbol	Description	Value	Ref.
	Polymerization rate	100/s	(34, 35)
	Depoly. rate (new)	1/s	(4)
	Depoly. rate (old)	30/s	(4)
kbr	Branching rate	1.4 × 10-3/(s.u. s)	(9)
kcap	Capping rate	0.2/s	est. in (36)
kon	Adhesion on-rate	0.07/(s.u. s)	est. from (37)
	Adhesion off-rate	4 × 10-4/s	est. from (38)
ksever	Severing rate	0/(s.u. s)	N/A
κ	Adhesion spring const.	10-3 N/m	(38)
a	Molecular scale	3 nm	N/A (est.)
ρnuc	Nucleation rate density	20/(μm2 s)	N/A
Δz	Branching region	10 nm	N/A (est.)
Δy	Branching region	50 nm	N/A (est.)
Δadh	Adhesion region	10 nm	N/A (est.)
η	Viscosity	0.02 Pa s	(39)
dt	Simulation time step	10-5 s	N/A