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The interaction energy between two filopodia as a function of their separation, d. The energy is minimized when the filopodia merge. The interaction range, d0, is approximately twice the diameter of the filopodium; d0 is ≈200 nm. The circles are our computational results and the solid line is a guide to the eye. The dashed line shows the estimated energy using the force estimate of Eq. 6.
