12905
Oxytocin and vasopressin mRNA expression in the paraventricular ( Pa ) and supraoptic nucleus ( SON ) of the hypothalamus were also determined using the real time - polymerase chain reaction and in situ hybridisation .
 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