2808
The HPV E1 and E2 proteins along with cellular factors , are required for replication of the viral genome .
 GENE: E1; GENE: E2
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: E1; GENE: E2