815
Mouse embryo cells ( C57BL / 6 , H - 2b ) transformed by the E1A and E1B genes of adenovirus type 5 ( Ad5E1 MEC ) are highly immunogenic .
 GENE: E1A; GENE: E1B
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: E1A; GENE: E1B