3754
Effect of transplanted mesenchymal stem cells from rats of different ages on the improvement of heart function after acute myocardial infarction .
 mesenchymal stem cells, heart, myocardial
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 mesenchymal stem cells, heart, myocardial