Ursolic and oleanolic acids suppress MNNG induced malignant transformation of human gastric mucosal epithelium by regulating the PI3 K/AKT pathway - Mingkun Liu; Jinsheng Dong; Li Wang; Yilin Li; Qingjuan Wu; Qi Zheng; Xiaji Zhou; Naili Yao; Runshun Zhang; Wenliang Lyu; Yuning Bai (Scientific Reports, 2025)