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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 typical micrograph of cell culture. The mitochondria of the cells are colored green; they may be used to estimate cell size. Normal cell nuclei are colored blue. Nuclei of non-viable cells are colored purple.