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. 2023 May 30;13(6):591. doi: 10.3390/bios13060591

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© 2023 by the authors.

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/).

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Optical measurements of tissue imprints. Histograms show the RI values of the imprints left on the biosensor by peritumoral (green) and tumor (red) tissue. A magnified image of a representative histogram is shown in Figure 1B.