10721
Among mammalian HSFs , HSF1 has been shown to be important for regulation of the heat - induced stress gene expression , whereas the function of HSF2 in stress response is unclear .
 mammalian HSFs, HSF1, HSF2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 mammalian HSFs, HSF1, HSF2