Modeling barbed end branching
by Arp2/3 complex: un autocatalytic  process
0
0.5
1
1.5
2
2.5
0
500
1000
1500
2000
Polymerised actin, µM
Time, s
A+A <==> F
F +A <==> F
k+1= 2.10-9 s-1 µM-1 
k-1= 5.10-4 s-1 
k+2= 10 s-1 µM-1 
k-2=    1 s-1 
Arp2/3
0-71 nM
F +Y+2A ===> 2F
app k+3 = 0.64 s-1µM-3
2Y <=> Y2
   active        inactive
K 4 = 10-2 µM