22056
Herein , we report ischemic - reperfused myocardial infarction ( MI ) repair with siRNA against Src homology region 2 domain - containing tyrosine phosphatase - 1 ( SHP - 1 ) , which is known as a key factor involved in regulating the progress of apoptosis in many cell types .
 tyrosine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 tyrosine