14459
In this report , a range of disaccharide or tetrasaccharide fragments of each sequence were chemically synthesized , and their activities in stimulating human Nod2 ( hNod2 ) were investigated .
 disaccharide, tetrasaccharide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 disaccharide, tetrasaccharide