1657
The mouse M - lysozyme downstream enhancer has been previously characterized on several levels of gene regulation .
 GENE: mouse M - lysozyme downstream enhancer
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: mouse M - lysozyme downstream enhancer 
Answer:
 GENE: mouse M - lysozyme downstream enhancer