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To address mechanisms that define interactions of Site II regulatory factors with this cell cycle control element , we have investigated these determinants of transcriptional regulation at the G1 / S phase transition in FDC - P1 hematopoietic progenitor cells .
 Site II regulatory factors
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Site II regulatory factors