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 ) .
 Chemical: nucleotide; Chemical: nucleotide
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: nucleotide, nucleotide 
Answer:
 Chemical: nucleotide; Chemical: nucleotide