The article titled “Usnea Acid as Multidrug Resistance (MDR) Reversing Agent against Human Chronic Myelogenous Leukemia K562/ADR Cells via an ROS Dependent Apoptosis” [1] contains a figure duplication in Figures 2 and 3, which was raised on PubPeer [2]. Specifically, Figure 2(c) panel UA + Adr overlaps with Figure 3(c) panel UA + Adr. The authors state that this was due to the incorrect file being selected during the preparation of the figure. The correct Figure 3(c) is as below.