10224
In late pregnant rats ( days 19 - 21 of pregnancy ) , spontaneous firing rates of oxytocin neurones were higher than in virgins , and the initial response to leptin was similar to that in virgin rats , although the increase in activity was more persistent .
 Chemical: oxytocin
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: oxytocin