7499
The ubiquitously expressed E12 bHLH protein dimerizes with numerous cell - specific bHLH factors .
 GENE: E12 bHLH protein; GENE: bHLH factors
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: E12 bHLH protein, bHLH factors 
Answer:
 GENE: E12 bHLH protein; GENE: bHLH factors