27880
Melatonin receptors within the proximal pituitary region , the pars tuberalis ( PT ) , are essential in regulating seasonal neuroendocrine responses .
 Chemical: Melatonin
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: Melatonin