28512
In the salinity exposure , 250ng / L EE2 - exposed females had significantly reduced 17 beta - estradiol ( E2 ) levels .
 EE2, 17 beta - estradiol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 EE2, 17 beta - estradiol