5590
Damage to the genes encoding proteins that function in intracellular signaling , transcription, or regulation of the cell cycle has been identified and linked at varying degrees to the progression of certain lymphoid malignancies .
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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:
 None