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Cathodic iontophoresis ejection rate characterization for ejections into brain tissue. (A) Average total fluorescence at steady state for ejections of different fluorescein solutions (n=6). All barrels contained 0.5 mM NaCl. (B) Total fluorescence for −90 nA ejections. (C) Total fluorescence for ejections of fluorescein solutions at a fixed ionic mole fraction of 0.15 (n=5). The remainder of the charge was due to NaCl.
