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Finally we demonstrated that selected donors showed potent protective effects in an in vivo murine model of myocardial ischemia - reperfusion injury , through a H2S - related mechanism .
 Chemical: H2S
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: H2S