712
Serum prolactin rapidly decreased after institution of treatment , with actual normalization ( less than 20 ng / ml ) by the 3rd month .
 GENE: 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: prolactin