Xiaoyan Sheng, Chenglei Tian, Linlin Liu, Lingling Wang, Xiaoying Ye, Jie Li, Ming Zeng, Lin Liu. Correction to: Characterization of oogonia stem cells in mice by Fragilis[J]. Protein&Cell, 2020, 11(7): 540-541. doi: 10.1007/s13238-019-00675-9