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Furthermore , expression of a multivalent but not a monovalent GAG containing syndecan - 1 proteoglycan recapitulates the elongation phenotype observed with the bivalent xylosides .
 xylosides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 xylosides