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Mast cell activation induced IL - 1beta expression in particular in nearby CD68 positive synovial macrophages .
 Mast cell, CD68 positive synovial macrophages
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Mast cell, CD68 positive synovial macrophages