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To define the activation of the STAT5 homologues and lower molecular weight variant in human monocytes and monocytes differentiated into macrophages by culture in macrophage-CSF ( M-CSF ), we measured the GM-CSF induced tyrosine phosphorylation of STAT5A , STAT5B , and any lower molecular weight STAT5 isoforms .
 M-CSF, STAT5, monocytes, STAT5, STAT5 homologues, STAT5A, STAT5B, macrophages, STAT5 isoforms, GM-CSF, human monocytes, macrophage-CSF
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, STAT5, monocytes, STAT5, STAT5 homologues, STAT5A, STAT5B, macrophages, STAT5 isoforms, GM-CSF, human monocytes, macrophage-CSF