1570
Plasma prolactin concentrations in pinealectomized ewes receiving melatonin treatment and in pineal intact ewes maintained under a non - 24 - hour photoperiod .
 GENE: Plasma prolactin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Plasma prolactin