Effect of Polyporus umbellatus polysaccharides on activation of murine bone marrow dendritic cells via Toll-like receptor 4 Effect of Polyporus umbellatus polysaccharides on activation of murine bone marrow dendritic cells via Toll-like receptor 4 Preparation of Polyporus umbellatus polysaccharides long circulating liposomes Effect of ginseng polysaccharide and Polyporus umbellatus polysaccharide on function of lymphocytes in enteric mucosa of rats Optimizing preparation technique of Polyporus umbellatus polysaccharides long circulating liposomes by orthogonal test