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
I'm familiar with several cations that the brain uses in ion channel condutions: potassium ($\mathrm{K}^+$), sodium ($\mathrm{Na}^+$), calcium ($\mathrm{Ca}^{++}$), and protons ($\mathrm{H}^+$). In my intro neurologoy class the only anion they mentioned was chlorine ($\mathrm{Cl}^-$). Do magnesiu...