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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(a) Schematic of implanted probe reaching multiple areas inside a rat brain; (b) neural probe with shank wiring bottleneck limiting the number of electrodes; (c) typical CMOS (complementary metal-oxide-semiconductor) back end-of-line cross section, with six metal layers.