Retraction of: DNA methylation-mediated downregulation of PTPN3 attenuates to boost TGF-β signaling in osteosarcoma cells. (25th August 2021) - Du, Kaili; Zhang, Xinliang; Lou, Zhenkai; Zhang, Fan; Guo, Peiyu; Gong, Hongda; Zhang, Chunqiang; Huang, Ying