Gramacidin A
Example of using IMD to study the permeation of ions through a gramicidin A channel. Depicted are a sodium ion (gold sphere), a gramicidin A dimer in ribbon representation, four of the lipid molecules comprising the membrane in which the channel is embedded (for clarity, not all are shown), and the surrounding water. Researchers using a haptic device or 3D tracker can interactively steer the ion through the channel and gather applied force data for analysis.