2699
The transcription factors Sp1 and PU.1 prime the CD11b promoter , but the nature of the factors responsible for its inducible expression are unknown.
 CD11b, transcription factors, PU.1 prime, CD11b promoter, Sp1
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:
 CD11b, transcription factors, PU.1 prime, CD11b promoter, Sp1