19404
These advantages , combined with the synthetic accessibility of the tetrazine molecule compared to other bio - orthogonal click reagents , make this cross - linking chemistry an interesting and powerful new tool for the development of cell - instructive hydrogels for tissue engineering applications .
 Chemical: tetrazine
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: tetrazine 
Answer:
 Chemical: tetrazine