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Fibroblasts of the host animal may thus have an important role in generating enhanced metastatic activity of H - 3 cells .
 Fibroblasts, H - 3 cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Fibroblasts, H - 3 cells