Fig. 6.

${\mathrm{K}}^{+}$ iontophoresis in acute brain slices. Measurement of fluorescence of the APG4 PAMAM-PEG nanosensor after iontophoresis of ${\mathrm{K}}^{+}$ in acute brain slices. Measurements were performed in the absence and in the presence of the ${\mathrm{K}}^{+}$ channel blocker 4-AP $(50\mu \mathrm{M},n=3)$.