19400
The implementation of bio - orthogonal click chemistries is a topic of growing importance in the field of biomaterials , as it is enabling the development of increasingly complex hydrogel materials capable of providing dynamic , cell - instructive microenvironments .
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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