2451
Immunohistochemistry scores for matrix metalloproteinase - 9 expression were significantly elevated compared to controls in scar endothelial cells and fibroblasts from 2 until 12 and 20 weeks , respectively .
 controls, scar endothelial cells, fibroblasts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 controls, scar endothelial cells, fibroblasts