1. Laboratory of Molecular Iron Metabolism, College of Life Science, Hebei Normal University, Shijiazhuang, People's Republic of China.
2. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology of China, Beijing, China.
3. State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Academia Sinica, Beijing, China.