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Photoelectric Artifact with a 473 nm laser set to 10mW. Red indicates 5 ms wide laser pulse onto a photosensitive 10 Ω-cm boron-doped silicon substrate. Ionic currents (blue) were recorded 100 μm away in 0.5% agarose in PBS. Note: the lead electrical artifact is negative and a positive deflection occurs after the laser pulse ends. †††
