1200
One of these elements , the homeodomain - binding element , was identified to mediate negative regulation .
 GENE: homeodomain - binding element
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: homeodomain - binding element 
Answer:
 GENE: homeodomain - binding element