6703
All rats were exposed to no , chronic low or chronic low with pulsatile high 17 beta - estradiol ( E2 ) replacement .
 Chemical: 17 beta - estradiol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 17 beta - estradiol