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pH sensitive multielectrode array (A); custom 16-channel electrometer circuit with a 2×gain (B); insertion computer-controlled manipulator of a piezoelectric actuator used for the adjustment of the height of the electrometer and neural probe (C); cortical cup filled with phosphate buffer were the Ag/AgCl reference wire was placed (D). Reprinted from Journal of Neuroscience Methods 160, 276–287 (reference 18), Copyright (2007), with permission from Elsevier.
