molecules Article Isolation, Characterization and Antitumor Effect on DU145 Cells of a Main Polysaccharide in Pollen of Chinese Wolfberry Fei Chen 1,†, Linwu Ran 1,2,*,†, Jia Mi 3, Yamei Yan 3,*, Lu Lu 3, Bo Jin 3, Xiaoying Li 3 and Youlong Cao 3 1 College of Public ...