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According to monosaccharide pattern , the weak acidic fractions of high alkaline ( 1 - 2M ) - based polysaccharide extracts was the most enriched with galactan - rich RG I .
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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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