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Putative steroid binding domain of the human mineralocorticoid receptor , expressed in E. coli in the presence of heat shock proteins shows typical native receptor characteristics.
 Putative steroid binding domain, heat shock proteins, human mineralocorticoid 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:
 Putative steroid binding domain, heat shock proteins, human mineralocorticoid receptor