12066
Spi-1/PU.1 proto-oncogene induces opposite effects on monocytic and erythroid differentiation of K562 cells .
 K562 cells, Spi-1/PU.1, proto-oncogene
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:
 K562 cells, Spi-1/PU.1, proto-oncogene