6114
The aim of this study was to in vitro investigate whether HA is able to reduce reactive oxygen species ( ROS ) - induced heart ischemia - reperfusion injury and activate the cardiomyocyte ' s damage surveillance systems .
 Chemical: oxygen
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: oxygen