2097
These results suggest that the regulation of nitrergic system by ERs may play a role in the control of oestrogen - dependent physiological mechanisms regulated by the SON and the PVN .
 Chemical: oestrogen
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: oestrogen