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The results showed that the expression of full - length T antigen rendered rat embryo fibroblasts ( REF ) sensitive to 5 - FU - induced apoptosis .
 embryo fibroblasts, REF
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 embryo fibroblasts, REF