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After incubation of purified MBP- or GST- HBD with rabbit reticulocyte lysate , known to be rich in heat shock proteins , we obtained saturable binding of [3H]aldosterone .
 heat shock proteins
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:
 heat shock proteins