13829
In this study , we propose an original , straightforward and versatile design of nucleotide and nucleotide analogue nanocarriers based on the natural polysaccharide chitosan ( CS ) .
 nucleotide, nucleotide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 nucleotide, nucleotide