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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 (https://creativecommons.org/licenses/by/4.0/).
P. (a) Photocurrent responses of A549 under different cell numbers, (b) Photocurrent responses of NCI-H460 under different cell numbers and (c) Photocurrent responses of NCI-H520 under different cell numbers.