An immortal porcine preadipocyte cell strain for efficient production of cell-cultured fat oleh Yun-Mou Cheng, Peng-Cheng Hong, Ming-Mei Song, Hai-Ning Zhu, Jing Qin, Zeng-Di Zhang, Hao Chen, Xing-Zhou Ma, Meng-Yuan Tian, Wei-Yun Zhu, Zan Huang