11453
IFN - alpha 2a - incorporated HA - Tyr hydrogels of varying stiffness were formed by changing the H2O2 concentration .
 Chemical: Tyr; Chemical: H2O2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Tyr; Chemical: H2O2