9437
All stimulations were down - regulated with GnRH - a commenced on day 21 in a long protocol before gonadotropin stimulation .
 GnRH - a, gonadotropin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 GnRH - a, gonadotropin