11459
Histological studies confirmed that tumor tissues in mice treated with IFN - alpha 2a - incorporated HA - Tyr hydrogels showed lower cell density , with more apoptotic and less proliferating cells compared with tissues treated with an IFN - alpha 2a solution .
 Chemical: Tyr
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