Effects of Chinese Propolis in Protecting Bovine Mammary Epithelial Cells against Mastitis Pathogens-Induced Cell Damage oleh Kai Wang, Xiao-Lu Jin, Xiao-Ge Shen, Li-Ping Sun, Li-Ming Wu, Jiang-Qin Wei, Maria Cristina Marcucci, Fu-Liang Hu, Jian-Xin Liu