Fig. 7. A-D. Representative light microscopy sections of hematoxylin and eosin-stained heart tissues of Wistar rats intratracheally instilled with either saline (control) or cerium oxide nanoparticles (CNPs), with or without cisplatin (CDDP) administration. (A) Representative heart section obtained from saline-treated rats showing normal heart with unremarkable changes. (B) Representative heart section obtained from CDDP + saline-treated rats showing heart with unremarkable changes. (C) Representative heart sections obtained from CNP-treated rats showing heart with unremarkable changes. (D) Representative heart section obtained from CDDP + CNP-treated rats showing heart with unremarkable changes. Scale bars: 50 µm.