28508
Exposure to 17 alpha - ethinylestradiol ( EE2 ) , a synthetic estrogen , has previously been shown to decrease reproductive endocrine status and egg production in northern mummichog ( Fundulus heteroclitus macrolepidotus ) .
 17 alpha - ethinylestradiol, EE2, estrogen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 17 alpha - ethinylestradiol, EE2, estrogen