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The objective of this study was to evaluate the immunomodulatory effects of the purified Ganoderma atrum polysaccharide ( PSG - 1 ) on murine macrophage cell line RAW264 . 7 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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