1473
The present studies have examined the effects of M-CSF on potential signaling pathways involving expression of the jun and fos early response genes .
 protein: M-CSF
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: M-CSF