Figure 3.

Mechanical interactions in viscoelastic actin filaments. (a) A schematic representation of single actin filament with series of springs and dashpots for the calculation of two kinds of elastic forces due to stretching and bending actin filament. (b) A schematic representation of branched actin filament for the calculation of two kinds of elastic forces due to branched and dihedral angles. ${\mathit{x}}_{i,j}^{\mathit{AF}}$ and ${\mathit{x}}_{k,1}^{\mathit{AF}}$ indicate binding sites of ARP2/3 complex. (c) A schematic representation of cross-linked actin filaments. ${\mathit{x}}_{i,l}^{\mathit{AF}}$ and ${\mathit{x}}_{k,l}^{\mathit{AF}}$ indicate binding sites of actin-crosslinker.