2809
We previously showed that granulocyte-macrophage colony-stimulating factor ( GM-CSF ) and macrophage colony-stimulating factor ( M-CSF ) stimulate the differentiation of human monocytes into two phenotypically distinct types of macrophages .
 M-CSF, macrophage colony-stimulating factor, granulocyte-macrophage colony-stimulating factor, GM-CSF, human monocytes, macrophages
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:
 M-CSF, macrophage colony-stimulating factor, granulocyte-macrophage colony-stimulating factor, GM-CSF, human monocytes, macrophages