$\mathrm{current\_density1}=\frac{\mathrm{v\_cyc\_nak1}\mathrm{pump\_density}\mathrm{elementary\_charge}}{\mathrm{membrane\_capacitance}}\mathrm{current\_density2}=\frac{\mathrm{v\_cyc\_nak2}\mathrm{pump\_density}\mathrm{elementary\_charge}}{\mathrm{membrane\_capacitance}}\mathrm{current\_density3}=\frac{\mathrm{v\_cyc\_nak3}\mathrm{pump\_density}\mathrm{elementary\_charge}}{\mathrm{membrane\_capacitance}}$