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In contrast, the binding activities of two ubiquitous transcription factors , Oct1 and Sp1 , remain high in G2/M .
 Oct1, Sp1, transcription factors
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:
 Oct1, Sp1, transcription factors