1673
The interaction between DDB and E2F1 can also be detected by coimmunoprecipitation experiments .
 GENE: DDB; GENE: E2F1
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: DDB; GENE: E2F1