2670
The Id4 protein contains a HLH domain highly conserved among the dnHLH proteins from mouse and drosophila .
 GENE: Id4 protein; GENE: dnHLH proteins
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: Id4 protein; GENE: dnHLH proteins