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The number of glucocorticoid receptors ( GCR ) in peripheral leukocytes was determined by radioligand-binding assay in extrinsic and intrinsic asthmatics .
 peripheral leukocytes, GCR, glucocorticoid receptors
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:
 peripheral leukocytes, GCR, glucocorticoid receptors