I am simulating an ion channel and require help placing a concentration of ions at one side of the box (below the membrane).
SETUP: membrane + embedded protein in the center of the cube. I tried to generate a smaller cube (of the required volume below the cube), solvate, add ions and then *cat* with the *.gro file of my system before solvating. But when I solvate the system with ions, the ions are removed. Any suggestions as to how to handle this problem?
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