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In this study, a purified polysaccharide was extracted and isolated from the fruitbodies of Lentinus edodes, and its anti-tumour effect and apoptosis-inducing activity in S 180 tumour bearing mice has been investigated.Results showed that JLNT enhanced the Bax/Bcl-2 ratios by up-regulating Bax and down-regulating Bcl-2, leading to the activation of caspase-3 and finally the initiation of cell apoptosis in S 180 tumour bearing mice(Fig.1).