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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/).
Fluorescence microscopy images of MCF-7 and MDA-MB-231 cells stained with DAPI. Chromatin and DNA fragmentation was observed after cells were treated with G4/MTX, G4-siRNA and G4/MTX-siRNA treatment groups that are represented by the arrows.