This invention provides a Dioscorea polysaccharide extract prepared by the method of this invention, which enhances the immunological activities by regulating the gene expression of cytokines. This invention further provides a Dioscorea polysaccharide extract, which has a synergistic effect with an oral vaccine and is capable of eliminating oral tolerance.

 
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> Calcium-independent negative regulation by CD81 of receptor signalling

> Tissue processor with integrated valve
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