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(A) Image of the autonomous sweat extraction and sensing platform (a thin layer of agonist agent hydrogel will be placed underneath the iontophoresis electrodes). (B) Image of iontophoresis and sweat sensor electrodes for Na+ and Cl− sensing. (C) Schematic illustrations of the iontophoresis and sensing modes. (D) System-level block diagram of the platform showing the iontophoresis and sensing circuits.
