24970
However , techniques to assemble HNP are few ; solitary examples exist of biocompatible polymers being formulated into HNP ; and knowledge on the biomedical properties of HNP remains rather cursory .
 None
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:  
Answer:
 None