8215
The concentrations of estradiol and testosterone , however , were generally higher in the 24 - week - old rats than in the 8 - week - old and 12 - week - old rats .
 Chemical: estradiol; Chemical: testosterone
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: estradiol; Chemical: testosterone