1657
The mouse M - lysozyme downstream enhancer has been previously characterized on several levels of gene regulation .
 GENE: mouse M - lysozyme downstream enhancer
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: mouse M - lysozyme downstream enhancer