2455
The later expression of matrix metalloproteinase - 2 and - 9 in fibroblasts suggests a role in extracellular matrix remodeling .
 fibroblasts, extracellular matrix
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 fibroblasts, extracellular matrix