Configuration snapshot of hydrophilic (yellow) and hydrophobic (red) components of amphiphilic molecules as two opposing membranes begin to fuse, forming an hourglass-shaped passage.

From the article:

Transition Path from Two Apposed Membranes to a Stalk Obtained by a Combination of Particle Simulations and String Method
Marcus Müller, Yuliya G. Smirnova, Giovanni Marelli, Marc Fuhrmans, and An-Chang Shi
Phys. Rev. Lett. 108, 228103 (2012)

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