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The increase in LT-293 CAT activity mirrored the increase in LT biologic activity seen under these conditions.
 LT, LT-293, CAT
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 LT, LT-293, CAT