For example, Singh et al. synthesized Mn3O4 nanoflowers (Mnfs) with SOD-, CAT- and GPx-like activities and found that they reduced ROS levels and the activation of caspase-3/7 in a 1-methyl-4-phenylpyridinium (MPP+)-induced PD-like cellular model, indicating that they may protect against neurological disorders such as PD 27. Here, CASP3 is linked to Parkinson disease.