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Finally, no transcription of the RAG-1 gene could be detected in all NK cell lines or clones analyzed.
 RAG-1 gene, NK cell lines
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:
 RAG-1 gene, NK cell lines