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TCF-1 knock-out mice , generated recently in our laboratory, have strongly decreased numbers of thymocytes , but are otherwise normal.
 TCF-1, thymocytes
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:
 TCF-1, thymocytes