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Nonradioactive quantification of glucocorticoid receptor expression during differentiation of human monocytic cells ( U937 ).
 monocytic cells, U937, glucocorticoid receptor
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:
 monocytic cells, U937, glucocorticoid receptor